Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1bb21d5e492672…

MALICIOUS

PDF

211.3 KB Created: 2020-08-23 18:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21e38ce7e59fb06c682aa5b84b0b4b84 SHA-1: f25f4cbb4e0971e45dcd3409816eea933edf94f6 SHA-256: 7a1bb21d5e49267289508efef515988bbfa478a2d27b37078e3b052e68a04b6c
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a search result for "astm standards pdf". This indicates a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is a high-confidence indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 3

  • 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.
  • 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=astm+standards+pdf
    • http://files.labeldogshippingsupplies.com/uploads/1/3/0/8/130873728/8847f54207.pdf
    • http://noxem.carnivalincovington.org/uploads/1/3/2/6/132682076/vukebu.pdf
    • http://files.acutepuncture.com/uploads/1/3/0/7/130775002/f26b0046171.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/3702/4668/files/88960870920.pdf
    • https://cdn.shopify.com/s/files/1/0429/1667/5740/files/dsm_5_bipolar_1_disorder.pdf
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/78757669332.pdf
    • https://cdn.shopify.com/s/files/1/0431/6420/5216/files/26693168294.pdf
    • https://cdn.shopify.com/s/files/1/0438/2100/7005/files/jurnal_atavisme.pdf
    • https://cdn.shopify.com/s/files/1/0434/3437/7377/files/pdf_to_word_i_love_converter.pdf
    • https://cdn.shopify.com/s/files/1/0432/7335/5424/files/grafica_de_pastel.pdf
    • https://cdn.shopify.com/s/files/1/0450/9371/6121/files/varanomoni.pdf
    • https://cdn.shopify.com/s/files/1/0440/1430/5430/files/45954226254.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002f007.bin
c4c77de79185a6e32b969612b4158c72aca0a6965e648bc7cf893bc7a336abbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2F007 2900 bytes
font_01_sfnt_off0002fa61.bin
98fb72794477b5dd428b5e0f1b8424b94b2ab63c08d50015c79d7eabe24dfced		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA61 5144 bytes
font_02_sfnt_off00030bc2.bin
c703634b5dda5791be09cf47191ffb291ae4af7ab69e488a16f5b7a96b9a17ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x30BC2 16652 bytes

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