Malicious PDF — malware analysis report

Static analysis result for SHA-256 c135909c0a9125c4…

MALICIOUS

PDF

40.2 KB Created: 2020-08-24 23:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9c7cf33a5a6fed53a0e96e18b511f1bd SHA-1: 8a9704a930c2e18ebdf6afb7e8d2765271c8fa6b SHA-256: c135909c0a9125c44583ede32e3b865f83b6f3a7f132906ba58993f9e3be6c2c
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, many of which point to external PDF files hosted on various domains, suggesting a link farm. One of the primary links, 'https://ttraff.ru/pify?keyword=cars+cake+template', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF links, reinforcing the lure. The ML classifier also strongly indicated maliciousness.

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=cars+cake+template In PDF document text
    • http://gunojipe.ordersocialeats.com/uploads/1/3/2/6/132682646/3227560.pdfIn PDF document text
    • http://files.jackandjillroc.org/uploads/1/3/0/7/130776041/tigugibiki_momigegejata_pinuwonira.pdfIn PDF document text
    • http://files.sorrowfulmother.net/uploads/1/3/2/6/132680822/ab2206.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/1/0437/2722/4986/files/estimation_and_costing_book_by_rangwala.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6829/1232/files/laboratoire_de_biologie_mdicale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2910/0701/files/beethoven_piano_sonata_13.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5498/9466/files/ma_pass_full_movie_free_300mb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3969/4741/files/91571489655.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1567/5815/files/gunstar_heroes_rom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3463/0554/files/minijok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2398/3001/files/razoxowiwovijizizipodek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62092070186.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/nifowiginibevalaneboposuf.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: sorrowfulmother.net 3 samples

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_off00005e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E82 5048 bytes
SHA-256: 968192e36d70c5da80217af94c3500c70ec4a2bb4b30d57cc3c99db50d8c4105
font_01_sfnt_off00006f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F97 10780 bytes
SHA-256: 7609a4d9c9486d929c6fde7005bcaa90ac6202ee54aa45aaf45246606961e25e

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