Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b71fb7c8d00a29…

MALICIOUS

PDF

42.2 KB Created: 2020-08-22 11:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 16da66c5a8c45abd92fcef08b4c29c6f SHA-1: 71db23b2d781b6f00f2022dab2bd40a8a202b06f SHA-256: 53b71fb7c8d00a29852b1989187a104481e5a39c22b9160474f71178e72ac4f1
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=audacity+full+version+2019'. The document body also contains this URL, suggesting a lure to download potentially unwanted software. The ML classifier strongly supports the malicious nature of this PDF.

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.com/pify?keyword=audacity+full+version+2019 In PDF document text
    • http://files.rollingsoundsdj.com/uploads/1/3/1/3/131379409/wapar-tofoguvuseme.pdfIn PDF document text
    • http://files.trinityumcmemphis.org/uploads/1/3/1/3/131383510/7544914.pdfIn PDF document text
    • http://ratuguke.andbardc.com/uploads/1/3/0/9/130969723/nujowefi.pdfIn PDF document text
    • http://zirivido.microfading.com/uploads/1/3/2/8/132814930/fimarurodo_wotaxixemo.pdfIn PDF document text
    • http://files.church633.com/uploads/1/3/2/6/132682640/9e051c04df85a1c.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/1/0430/4489/6925/files/fusazumowiwofejarazub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3531/1775/files/core_curriculum_for_holistic_nursing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6451/7023/files/certified_beer_server_cheat_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6092/7393/files/kamala_das_my_story_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9227/9445/files/guwamafewutoju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6649/8965/files/kunewokuni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5731/3957/files/experience_certificate_sample.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1483/0749/files/behringer_x-_touch_compact_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5881/3333/files/zoruguvutadori.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3508/2402/files/pavolamonavatogamubir.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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65D2 5648 bytes
SHA-256: f6cd98a90faaf5994eb6eb61a95bd4821ad9ea96fe10a7147b31e07e942ad8c4
font_01_sfnt_off0000791f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x791F 10272 bytes
SHA-256: 0e5dd9faec45a27b34ee084e9d8e4616e5721adedd31f7983509bfae8f00cae8

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