Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c6ecf4f166d7aa…

MALICIOUS

PDF

54.3 KB Created: 2020-08-06 09:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ab768c5ac96f8c14f20a302696e24094 SHA-1: 784a1582bd04c38d8fe9869db1debab3f8f040aa SHA-256: 31c6ecf4f166d7aab7e211bf27c238142cc433049684971c2d027c36a3c284e5
194 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'English story book free download pdf' and the malicious URL, suggesting a lure to download content. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the presence of a link to malicious infrastructure, and PDF_SEO_LINK_FARM indicates a link farm strategy. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=english+story+book+free+download+pdf In PDF document text
    • http://files.hayhyer.com/uploads/1/3/0/7/130775084/631683.pdfIn PDF document text
    • http://files.fishmougey.com/uploads/1/3/2/7/132741348/7028152.pdfIn PDF document text
    • http://files.zackbacak.com/uploads/1/3/1/8/131856626/802f57bb9499b.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/1/0433/4724/7263/files/basic_accounting_questions_mcqs_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0854/0324/files/87347261761.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1097/3083/files/34089736419.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9118/8117/files/dakenikebelajaxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0002/0635/files/raleki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6285/3794/files/78280077490.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9676/8661/files/tinizelutewejokin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4819/6513/files/css_reset_file.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9587/6003/files/12066002427.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0996/5212/files/57178110873.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0597/5462/files/the_new_oxford_picture_dictionary_english_spanish_free_download.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
🗂 Part of campaign: fishmougey.com 3 samples

Related samples 3

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_off0000961c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x961C 5656 bytes
SHA-256: ff42542c74a771767c4ecc3a909e280754ae97fd4617aae1a0de90dc22266c95
font_01_sfnt_off0000a97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA97C 10276 bytes
SHA-256: 0935764de6a69232a6068df1341950e207d8bd5ba7aab95ee7f1f76b782de052

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