Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf1a87e5240dff8…

MALICIOUS

PDF

45.9 KB Created: 2020-08-19 18:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28dce0503d1363e463336ec38cc44ae3 SHA-1: 9547f29e17b830c7999c198094e164353cbdfb46 SHA-256: 9cf1a87e5240dff8f93ad61b8f0295fb8f646d3e667706ab00843684b6c0ba55
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or redirection scheme. One prominent URL, https://ttraff.ru/pify?keyword=if+else+statement+in+java+android+studio, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this same URL and references to Java programming, likely serving as a lure to encourage clicks. The ML classifier strongly indicates 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.ru/pify?keyword=if+else+statement+in+java+android+studio
    • http://genaso.lindsaykomar.com/uploads/1/3/1/1/131164250/246ca7f3a40.pdf
    • http://jakonax.rampantoutdoor.com/uploads/1/3/1/4/131405927/9893411.pdf
    • http://files.theartonym.com/uploads/1/3/0/8/130813988/lamozufebugibeko.pdf
    • http://zexunabo.schoettlerhomeimprovements.com/uploads/1/3/1/4/131453109/raxopu-voxumiwomagoxo-zekowuzabim-difasokusi.pdf
    • http://files.termarkleather.com/uploads/1/3/2/6/132682665/85b01c3aa355523.pdf
    • https://cdn.shopify.com/s/files/1/0440/3943/8501/files/bolalesinumorufiwanala.pdf
    • https://cdn.shopify.com/s/files/1/0431/8615/9767/files/butizame.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/18222213963.pdf
    • https://cdn.shopify.com/s/files/1/0432/7532/1499/files/vejekeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/7763/1126/files/16517467556.pdf
    • https://cdn.shopify.com/s/files/1/0430/8697/1033/files/netgear_extender_ac1900_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/kabite.pdf
    • https://cdn.shopify.com/s/files/1/0432/0336/2973/files/taxuri.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9874/files/rijew.pdf
    • https://cdn.shopify.com/s/files/1/0429/6353/3977/files/john_wick_chapter_1_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/8145/8069/files/low_back_exercises_for_pain.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007739.bin
fee00d52905009d1b64dc7d635285f6723a970de81a8b1e5330bcf3d3bfbe24a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7739 5124 bytes
font_01_sfnt_off00008892.bin
76eb69acb0cebe01a1dba6770b04e9c0c2f72794856312d9a35fb3ff633785d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8892 9992 bytes

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