Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf12dc3670c34bc…

MALICIOUS

PDF

44.5 KB Created: 2020-08-28 00:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4da7ba7e16beeab38f9b33dd3937f5b SHA-1: e892adfa371d55518850f738f5ed42fe5add5516 SHA-256: ebf12dc3670c34bcc1bf35db7cd6e620fb240915ad3947d8682df48584812c81
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body text, though heavily obfuscated, contains the string 'The amazing spider man 2 apk', suggesting a lure to download potentially malicious software. The ML classifier also strongly indicated maliciousness.

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=the+amazing+spider+man+2+apk+1.1.7+f
    • http://wepovis.offthestreetfoodfest.com/uploads/1/3/1/4/131409090/8752255.pdf
    • http://files.greenvalleyroastingcompany.com/uploads/1/3/0/7/130775952/banimux.pdf
    • http://files.dropintoinfinity.com/uploads/1/3/2/7/132710748/1554800.pdf
    • http://files.nathanjoyal.com/uploads/1/3/1/1/131163635/b5d570a55490.pdf
    • https://cdn.shopify.com/s/files/1/0433/1552/7833/files/vapegemosusutume.pdf
    • https://cdn.shopify.com/s/files/1/0437/3803/8423/files/noladaboza.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/98498448732.pdf
    • https://cdn.shopify.com/s/files/1/0438/2133/4690/files/71632754768.pdf
    • https://cdn.shopify.com/s/files/1/0437/5887/8881/files/94305553311.pdf
    • https://cdn.shopify.com/s/files/1/0436/4887/6702/files/wumivapigupezunaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/1006/4537/files/bertoldo_bertoldino_y_cacaseno.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1040/files/kubalalugisanilesabojo.pdf
    • https://cdn.shopify.com/s/files/1/0438/7612/2779/files/41758213386.pdf
    • https://cdn.shopify.com/s/files/1/0435/5470/1461/files/dolewumi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/zizupisufeditafisave.pdf
    • https://cdn.shopify.com/s/files/1/0431/4624/8358/files/java_swing_display.pdf
    • https://cdn.shopify.com/s/files/1/0438/8922/9979/files/jasunuduzenimod.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/
    • https://cdn.shopify.com/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000636a.bin
619a44e8b5c2a2d3fc0e18259d8022938ad4f8b30552901bc68dc41c3d0f2ef0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x636A 2880 bytes
font_01_sfnt_off00006da8.bin
4256c8e02301d3d72d8946c624682e14a7248b62cdaad896121703f7147d227c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA8 5780 bytes
font_02_sfnt_off00008151.bin
f6bcb6ab513d91ac865cea89f25fd7d37bea3b6bcffb79d9ee32d8f01909723c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8151 10440 bytes

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