Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce5f17446f1678b…

MALICIOUS

PDF

40.0 KB Created: 2020-08-11 03:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aac245a05088a8846dd2da257cd600f6 SHA-1: c7596010495974bddd169f681865e6e0a59e2ede SHA-256: 6ce5f17446f1678bd216e00e2a161e1c8f67681a1b6d5e3bcff0e7952515ed0f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) known for malicious activity. The document body, though heavily obfuscated, contains references to the malicious URL and other potentially benign PDF links, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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=bescherelle+d+orthographe+pdf
    • http://lajav.stephaniecpassman.com/uploads/1/3/1/4/131453177/2583864.pdf
    • http://kufamo.caricaturedubai.com/uploads/1/3/0/7/130739664/kojevetofo_sawitajevono.pdf
    • http://files.navigatetheear.com/uploads/1/3/1/1/131164520/reginifadev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0057/8723/files/waterfall_model_tutorialspoint.pdf
    • https://cdn.shopify.com/s/files/1/0429/3974/4419/files/13742769951.pdf
    • https://cdn.shopify.com/s/files/1/0430/5158/1591/files/6663430181.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/gezunomowipemepotina.pdf
    • https://cdn.shopify.com/s/files/1/0428/4842/0007/files/kusojokawibasunifotobev.pdf
    • https://cdn.shopify.com/s/files/1/0434/2756/1634/files/voiced_and_voiceless_sounds_chart.pdf
    • https://cdn.shopify.com/s/files/1/0429/0406/0071/files/asrock_a-_tuning.pdf
    • https://cdn.shopify.com/s/files/1/0431/6315/6641/files/visual_studio_2010_shell_redistributable.pdf
    • https://cdn.shopify.com/s/files/1/0437/5294/7863/files/88172713892.pdf
    • https://cdn.shopify.com/s/files/1/0432/7990/9030/files/mcculloch_chainsaw_repair_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/5198/0712/files/lusevitunibijabok.pdf
    • https://cdn.shopify.com/s/files/1/0429/3437/0470/files/tarijopulodakip.pdf
    • https://cdn.shopify.com/s/files/1/0429/8326/0314/files/royal_caribbean_anthem_of_the_seas_deck_plan.pdf
    • https://cdn.shopify.com/s/files/1/0449/8325/5198/files/billie_s_bounce_charlie_parker.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000592c.bin
0f096d2635b36352d5297b36267ff4d9fa6311a944027be41d0669a1278f5a4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x592C 5468 bytes
font_01_sfnt_off00006bbd.bin
08451b68f32d23c0c15dacbb3ae2635cf4f1052c96ef367cf1693297344b263c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBD 11644 bytes

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