Malicious PDF — malware analysis report

Static analysis result for SHA-256 af336d923176765c…

MALICIOUS

PDF

63.3 KB Created: 2020-08-22 11:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d6b823dd28bd5ed7e333e8fe1003daf SHA-1: d872b6ed2ad0c498e0f43bd4a511080a1bd887a3 SHA-256: af336d923176765ca98b6f4ad115078f915ff5bc3b0dd96adbe3636ba9bc63d6
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=data+engineer+interview+questions+and+answers', is identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain the same URL, suggesting a lure to trick users into clicking on a link related to interview questions. The PDF also hosts a large number of other links, many pointing to Shopify, which is characteristic of SEO link farm abuse.

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=data+engineer+interview+questions+and+answers
    • http://files.muskiechoir.com/uploads/1/3/0/9/130969059/mowalorox.pdf
    • http://files.atlantaicedanceweekend.com/uploads/1/3/2/8/132814241/0fab84.pdf
    • http://lewefoti.youthgolfersoutreachprogram.org/uploads/1/3/1/4/131454012/setuwefokameneviz.pdf
    • https://cdn.shopify.com/s/files/1/0438/6213/0848/files/31923798460.pdf
    • https://cdn.shopify.com/s/files/1/0436/9265/4745/files/17729085573.pdf
    • https://cdn.shopify.com/s/files/1/0436/9825/8088/files/30348519334.pdf
    • https://cdn.shopify.com/s/files/1/0431/2468/7014/files/oregon_trail_emulator.pdf
    • https://cdn.shopify.com/s/files/1/0428/1414/4675/files/biochemistry_and_molecular_biology_5th.pdf
    • https://cdn.shopify.com/s/files/1/0432/6499/9590/files/98831258412.pdf
    • https://cdn.shopify.com/s/files/1/0454/3460/1640/files/main_points_of_18th_amendment_in_pakistan_constitution.pdf
    • https://cdn.shopify.com/s/files/1/0429/9200/9365/files/kobexamijejafitirixexez.pdf
    • https://cdn.shopify.com/s/files/1/0437/8784/5790/files/artisteer_4._3_full_crack.pdf
    • https://cdn.shopify.com/s/files/1/0435/9746/3715/files/baraye_dil_e_dukhtar_noha.pdf
    • https://cdn.shopify.com/s/files/1/0438/2323/5232/files/lifuwikun.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3383/files/28211475340.pdf
    • https://cdn.shopify.com/s/files/1/0462/3545/1543/files/ipoh_malaysia_travel_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/6100/9818/files/44717216752.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_off0000ba08.bin
7dce9c1896fbb490a24274f6875beb44106e272523c66c72ed5b5f13ab005cfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA08 5240 bytes
font_01_sfnt_off0000cbf3.bin
3c1aacf783d9612851b6513557939aea05674b710d291ccecccc752ae8538f71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF3 10516 bytes

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