Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4941beb8cb5cf9…

MALICIOUS

PDF

41.0 KB Created: 2020-08-20 06:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a57be4897b1ce4bf74c6580d9b91324 SHA-1: 12e988cecf566af4bab7e2892085604fabd179e5 SHA-256: bf4941beb8cb5cf95a66a2e3e55c6bdfacc2fb8b22a579abf5527aec8ef3ae4e
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL and a seemingly unrelated Shopify URL, suggesting a lure to a malicious site. The PDF also exhibits characteristics of a link farm, with numerous external links, many pointing to Shopify, likely to obscure the malicious redirector.

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/pify?keyword=black+widow+remix+song
    • http://files.bookcellarlwonline.com/uploads/1/3/1/8/131860787/xejapami.pdf
    • https://cdn.shopify.com/s/files/1/0429/8883/0873/files/backwards_design_lesson_plan_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/1184/0927/files/24078596106.pdf
    • https://cdn.shopify.com/s/files/1/0437/2758/5445/files/nifogo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/basics_of_networking_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8316/9943/files/razipul.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/keganoremuneferodimobowaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/4986/7681/files/b._ed_syllabus_for_entrance_exam.pdf
    • https://cdn.shopify.com/s/files/1/0437/2905/9992/files/bilazedugarokikojofu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2308/1373/files/git_vs_mercurial.pdf
    • https://cdn.shopify.com/s/files/1/0428/7175/0823/files/gubebitekokewobafakav.pdf
    • https://cdn.shopify.com/s/files/1/0434/6734/1974/files/redomewevafeladad.pdf
    • https://cdn.shopify.com/s/files/1/0428/3557/4943/files/71885239627.pdf
    • https://cdn.shopify.com/s/files/1/0433/2732/4310/files/lijafu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9338/5633/files/bagigerisipimikotekit.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_off000045ad.bin
70db6ea161e574cf171e0fe02769df3c0f17e790d65a689c0f8fbb7fac111ff0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45AD 5532 bytes
font_01_sfnt_off00005874.bin
0af577336ffed1289aaf87cbafddc887b5c775971941a81cdacf6bc4e4a1727d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5874 9660 bytes
font_02_sfnt_off000079c5.bin
bbbbc52c971caab0581048e8d1385f913e9e0ca321de6dc4d4c11fbd15d0d879		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79C5 18856 bytes

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