Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c0c8d2a09011d9…

MALICIOUS

PDF

53.0 KB Created: 2020-08-18 14:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 072f8b4a03debd581b04ad4a13573d7b SHA-1: c63d13053a5ff49acd4d127b002554a71ad654a8 SHA-256: 79c0c8d2a09011d934313151f94302f2b8078eb53820534435086475c6223553
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=formal+wear+for+university+interview'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of this malicious infrastructure.

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=formal+wear+for+university+interview
    • http://files.frankhagancontracting.com/uploads/1/3/2/6/132681404/zatamutofineve.pdf
    • http://duxisakub.mutual-aid.com/uploads/1/3/1/3/131379477/1837112.pdf
    • http://files.laurajholmanart.com/uploads/1/3/1/1/131163533/wulufelo.pdf
    • http://lijogaw.herbanbiophiliac.com/uploads/1/3/1/6/131606490/juget.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0439/6069/6990/files/osrs_black_demon_slayer_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/user_interface_design_in_software_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0428/4284/9446/files/kejajeda.pdf
    • https://cdn.shopify.com/s/files/1/0437/5396/3678/files/your_love_awakens_me_chords.pdf
    • https://cdn.shopify.com/s/files/1/0450/9886/0707/files/85521590841.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/mimotodeludoja.pdf
    • https://cdn.shopify.com/s/files/1/0428/3321/5654/files/24602843913.pdf
    • https://cdn.shopify.com/s/files/1/0431/4071/0562/files/capteur_d_humidit_du_sol.pdf
    • https://cdn.shopify.com/s/files/1/0432/5949/4555/files/sepikagimuwilij.pdf
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/black_american_comedy_movies_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/2562/0374/files/xilozomavupukekiposak.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2214/files/the_next_episode_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0436/0693/3661/files/32980315685.pdf
    • https://cdn.shopify.com/s/files/1/0435/1308/6106/files/pirates_of_silicon_valley_dual_audio.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000084df.bin
d9787679f6e5c6def825d8092218abea9c075d84d4ff49638a790474588da564		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84DF 5004 bytes
font_01_sfnt_off000095e0.bin
eeab543445d25e71d8708a2ecfa16ece0945397df8d085bb87fb7fcb69229528		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95E0 10148 bytes
font_02_sfnt_off0000b83f.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB83F 4324 bytes

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