Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d4b423dc5ff34e…

MALICIOUS

PDF

44.8 KB Created: 2020-08-14 00:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7761a37deb68827ef909bb58f26b2e25 SHA-1: bedf4fbcecc5c8766a2a64fe75b3ec8e0bff4e6b SHA-256: 25d4b423dc5ff34e4b01b9116d3439b9f6188c3fab3a5820ca93bacca1ab0794
242 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass external link farm, with many links pointing to benign Shopify domains but one critical link to a known malicious redirector. The presence of a 'download button' heuristic further supports the lure. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=bacula+server+linux In PDF document text
    • http://files.yardmanpress.com/uploads/1/3/1/3/131398374/9751238.pdfIn PDF document text
    • http://files.hsccmilwaukee.com/uploads/1/3/0/8/130813715/kapafoxunesozuf.pdfIn PDF document text
    • http://files.sleepingbeeathome.com/uploads/1/3/0/8/130814682/3567921.pdfIn PDF document text
    • http://files.fibrocysticbreastnaturalhealth.com/uploads/1/3/0/9/130968943/gakuv.pdfIn PDF document text
    • http://files.12stepstolovingtheself.com/uploads/1/3/1/6/131637679/vedubezadozu-zogizunosizap-guvinafevopas-pozusewuzusetu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3075/8054/files/mulobafod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/topofatufipegakupok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0727/0312/files/savegubi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1506/1153/files/41962396499.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/60807374902.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5570/9341/files/pitotewupelovogeje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9889/7574/files/83452054873.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1043/1896/files/radaminozarav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9128/7450/files/8x12_lean_to_shed_plans.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4982/9023/files/italian_stories_for_beginners.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4953/4111/files/pasonokubezaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/riwemabosemuridaredexe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9569/5268/files/35991706599.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5471/9395/files/cs_lewis_short_stories.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7189 4968 bytes
SHA-256: 4d212aa27eff95a3b56631a55f8d56cea0ecfc3f3455c311364e45bfc9753b64
font_01_sfnt_off0000827c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x827C 10520 bytes
SHA-256: 4fb4830d294fb03951b5144ede5db83e7287330c4e48a8ac984707a7cd013965