Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5666b11f75614ce…

MALICIOUS

PDF

50.1 KB Created: 2020-08-20 20:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 10d0358d58265aed06da73dfceef1b6f SHA-1: 78b4f4d07076f204e2dda6c3df34b809371ecd09 SHA-256: c5666b11f75614cead5a60bc525bab9051d53312237196bb56ae273474f4567b
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, forming a link farm, with one critical link redirecting to a known malicious URL. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted from this sample, but the extensive use of malicious and link farm URLs indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.
  • 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.ru/pify?keyword=android+10+release+verizon In PDF document text
    • http://files.eastcoastcakeco.com.au/uploads/1/3/1/4/131437378/3a35521a0c4.pdfIn PDF document text
    • http://files.westmeadhospitalwhistleblowers.com/uploads/1/3/1/8/131856195/rimoratabijomova.pdfIn PDF document text
    • http://redom.ipksportsbetting.com/uploads/1/3/1/8/131857252/xulubafude_fowiwu_sowelorujigeb_kamagigo.pdfIn PDF document text
    • http://betukal.ofcstrategy.com/uploads/1/3/2/6/132680869/ad1cb398864.pdfIn PDF document text
    • http://files.iguanamercenary.com/uploads/1/3/1/0/131070452/500861.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/1/0431/3609/0273/files/bahria_town_karachi_full_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2281/0268/files/34928381045.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6020/8540/files/biwamewumelejogaxuwobiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5863/4658/files/nemiparuwuginotapu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9350/5688/files/subnautica_base_building_tips.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3463/0554/files/aptitude_test_for_pilot_training.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2451/5235/files/59260103847.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4286/4294/files/10015280021.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3425/5265/files/wixixexanudalo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2247/4651/files/android_x86_dual_boot_easybcd.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/buduje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0660/5981/files/bose_soundbar_700_remote_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4480/5525/files/2330742192.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4507/7671/files/age_definition_sociology.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_off00008639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8639 5112 bytes
SHA-256: cec35bf5b936429c0b6a66afd19e57ed8aa467eb43d6897489c70a64d07238cf
font_01_sfnt_off000097b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97B5 10528 bytes
SHA-256: 898aa3b3282b17da0606812dd7789fec793b27021b6f89dbd7cc33ed9d577b5c