Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b4e72059a8ce94…

MALICIOUS

PDF

40.4 KB Created: 2020-08-18 19:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 31c139932b603b33b505bb966e1fc2a4 SHA-1: d248f7593194a81bb7c9abc5579f738302349a02 SHA-256: 13b4e72059a8ce94e1fec11f238b87e61402ec6dede989b29267f627844a939c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to redirector infrastructure like 'ttraff.cc', which is flagged as malicious. The document body, though partially corrupted, contains text suggesting a lure for 'Whatsapp for android', and the presence of multiple PDF links indicates a link farm designed to distribute malicious content. The ML classifier strongly supports the malicious verdict.

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.
  • SEO-redirector lure link (multi-word utm_term) low PDF_SEO_UTM_REDIRECTOR_LINK
    PDF contains a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the search-keyword gateway used by the 'free document download' phishing family. Surfaced as an IOC; on its own this is a low-confidence signal.
  • 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=whatsapp++for+android+2.+2.+3 In PDF document text
    • http://gumobit.velvetmilitia.com/uploads/1/3/1/3/131383657/liruzobovuse.pdfIn PDF document text
    • http://sidozitep.connectionsthruart.com/uploads/1/3/1/4/131437462/4865349.pdfIn PDF document text
    • http://files.downsjuniormusic.com/uploads/1/3/0/9/130969809/0956f.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/1/0438/8628/0872/files/lakufedo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0893/3540/files/vuzevewefewunu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9445/0078/files/73996724684.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2359/6711/files/rufemalovewexupefo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6931/7020/files/rixudaxelufopizuxaxobo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6001/7814/files/autopage_remote_start.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2806/2109/files/81492651499.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0574/7108/files/gedofufalikomiz.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 1

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_off00006047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6047 5440 bytes
SHA-256: ddb5c5f58d1de003a7e4130d80aa67162db1963b2f585b03360bd69ccbe30592
font_01_sfnt_off000072d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72D3 9912 bytes
SHA-256: d9df29700f460fc64127e5fc6328d6c7fc71ac752d3114068188154ec4a36dc4

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