Malicious PDF — malware analysis report

Static analysis result for SHA-256 131d978658a0f153…

MALICIOUS

PDF

45.9 KB Created: 2020-08-16 13:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: fed4f59e50f92ea7510122b4682815b3 SHA-1: 3df1e2533f6feabbdde3b58128caee1533304e04 SHA-256: 131d978658a0f153cfad95b892a0de763cc3c23d7699be752086f3505b3deab2
194 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body and heuristics suggest a lure for free downloads, specifically mentioning 'advanced english speaking skills pdf', which redirects to 'https://ttraff.com/pify?keyword=advanced+english+speaking+skills+pdf'. This pattern is consistent with phishing or scam attempts to redirect users to malicious sites.

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=advanced+english+speaking+skills+pdf In PDF document text
    • http://minidek.lvapa.com/uploads/1/3/2/7/132741099/numobodas_gojetavilin_xufum.pdfIn PDF document text
    • http://files.wwdurantstory.com/uploads/1/3/0/9/130969260/bonosifusuz.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/1/0430/9667/0365/files/sintesis_de_auxinas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4875/4600/files/david_banner_like_a_pimp.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2402/1664/files/joomla_templates_3._8_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2371/8824/files/87286411878.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/arachne_the_weaver_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5791/3754/files/begum_rokeya_biography_in_bengali.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4953/2057/files/ang_abakada.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5061/4429/files/the_history_of_thailand.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5444/8286/files/62152934068.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3248/5793/files/texatoza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1390/6327/files/giwobodobinifewofir.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_off000074d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74D9 5432 bytes
SHA-256: f8138a6d58047aa29bf33ee9e50f445addd78d1bc62db97f7ea5d5cf6937fe7c
font_01_sfnt_off0000875f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x875F 10492 bytes
SHA-256: 73b32a829122f7527b05968dbbf62f13c6640878f3911d34e924de52ea968c47

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