Malicious PDF — malware analysis report

Static analysis result for SHA-256 26122fc504a41e6d…

MALICIOUS

PDF

69.4 KB Created: 2020-08-05 17:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 132e3662a4671de959b955e13b09d033 SHA-1: 8ccf98e452dab58e3d808767a5f0b1f82650cf8a SHA-256: 26122fc504a41e6d634d8f3757fe0203d54492a2b8c1cbce4489704f3c34a118
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to domains associated with link farms and redirectors, indicating a phishing or malicious redirection attempt. The primary malicious URL identified is https://ttraff.ru/pify?keyword=binomische+formeln+erkl%25C3%25A4rung+pdf, which is flagged as a malicious redirector. The document body, though partially corrupted, contains references to the same search term, suggesting a lure to attract users searching for educational material.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=binomische+formeln+erkl%25C3%25A4rung+pdf
    • http://files.jacobveritas.com/uploads/1/3/1/3/131383681/1cbe68daa9.pdf
    • http://files.tuning-my-heart.com/uploads/1/3/1/3/131398094/3841940.pdf
    • http://files.childsafechildproofing.com/uploads/1/3/1/0/131071056/7011162.pdf
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/deezloader_remix_4._2._2.pdf
    • https://cdn.shopify.com/s/files/1/0437/6104/1559/files/cs_interview_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4828/files/12051006676.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/palugepenaker.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50398535586.pdf
    • https://cdn.shopify.com/s/files/1/0434/5217/0392/files/bozawosusanemimusebo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5897/0280/files/learning_spanish_words.pdf
    • https://cdn.shopify.com/s/files/1/0428/3862/2375/files/kadefuwirul.pdf
    • https://cdn.shopify.com/s/files/1/0432/9770/2046/files/pekafafi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3953/8851/files/befalusabajam.pdf
    • https://cdn.shopify.com/s/files/1/0434/8660/9573/files/45410400831.pdf
    • https://cdn.shopify.com/s/files/1/0437/1084/1000/files/tears_of_a_tiger_questions.pdf
    • https://cdn.shopify.com/s/files/1/0427/7826/3718/files/fasefafeworenekux.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab3f.bin
336743cbb26147a9e5146ab29f58748742ff318b1ad9c032ada2d1809f637e0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB3F 5708 bytes
font_01_sfnt_off0000be88.bin
4fe6cbad274de88a7ac4517466f47131f6d70089fe23cce20b28d80a1d4db802		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE88 16120 bytes
font_02_sfnt_off0000f0a7.bin
41a1e3123543f644a57326630ff86f4f1f73d493934815d3d115716ffecdfc88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A7 16196 bytes

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