Malicious PDF — malware analysis report

Static analysis result for SHA-256 585b7d07b4194ca5…

MALICIOUS

PDF

41.3 KB Created: 2020-08-31 13:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df2f31539ede62822c6f1a8c2e60f4d9 SHA-1: db30f1c0514c78f9a8065adfb9803aa3865d1bc1 SHA-256: 585b7d07b4194ca54ed60451addd326e848ed4c65fff6ced7b908156e51193ac
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the malicious URL. The presence of multiple links, including to benign Shopify domains, suggests an attempt to disguise the malicious intent as a link farm, likely for SEO manipulation or to host further malicious content.

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.com/wix?keyword=deutscher+sauna+bund+E.+v
    • https://cdn.shopify.com/s/files/1/0432/5618/4992/files/exercice_orthographe_6me.pdf
    • https://cdn.shopify.com/s/files/1/0440/8741/0840/files/ielts_4000_academic_word_list.pdf
    • https://cdn.shopify.com/s/files/1/0427/5293/4044/files/rip_trainer_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87899810879.pdf
    • https://cdn.shopify.com/s/files/1/0450/3732/2390/files/best_buy_weekly_ad.pdf
    • https://cdn.shopify.com/s/files/1/0434/6963/5746/files/nanajejewafotene.pdf
    • https://cdn.shopify.com/s/files/1/0437/7329/6801/files/89912035780.pdf
    • https://cdn.shopify.com/s/files/1/0435/6292/6229/files/cours_algorithme_openclassroom.pdf
    • https://cdn.shopify.com/s/files/1/0438/2241/6029/files/modal_verbs_exercises_advanced_with_answers.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_off000054da.bin
e60b1102e9f273d5a79dfd77c18f3fa93c3989717e0cb53ae2ae361090896974		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54DA 5000 bytes
font_01_sfnt_off000065da.bin
88fb7f05a9e7300ef537d7981fa578b26eb39845feb9dbe6823a801b5313f40c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65DA 11168 bytes
font_02_sfnt_off00008aa9.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA9 4324 bytes

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