Malicious PDF — malware analysis report

Static analysis result for SHA-256 813697ee1fc6700f…

MALICIOUS

PDF

46.6 KB Created: 2020-08-05 07:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bde5cb05bfe0284913dacf134d14723f SHA-1: e58277f136fbba9c09ac6407e61ca78273cce7b5 SHA-256: 813697ee1fc6700fd1a3005a5c34b181e610c987e5415663558eddc70be43094
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 a redirector infrastructure known for malicious activity. The document body, though malformed, includes a URL that appears to be a lure for educational content, likely to trick users into clicking malicious links. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector and link farm attack pattern.

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=ncert+chemistry+book+class+11+pdf+free+download
    • http://files.macdonaldcounselling.com/uploads/1/3/0/7/130776065/renomodaxabopa-pudaradoje-ripuxuvegikowu.pdf
    • http://files.sarahitkin.com/uploads/1/3/1/3/131398244/48e155c7e47b2.pdf
    • http://files.littleworldeq.com/uploads/1/3/1/3/131384468/vometawafe-pokujewiruxos.pdf
    • http://jodapu.janeheyesart.com/uploads/1/3/1/4/131407406/govokumirejiwago.pdf
    • http://files.seetheworld.tours/uploads/1/3/2/8/132815961/bawifutopite.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/5677/5839/files/75106719471.pdf
    • https://cdn.shopify.com/s/files/1/0434/6413/0725/files/62103272278.pdf
    • https://cdn.shopify.com/s/files/1/0432/0047/9391/files/mw3_mod_menue.pdf
    • https://cdn.shopify.com/s/files/1/0435/3127/2351/files/rorulavilupuvaxasi.pdf
    • https://cdn.shopify.com/s/files/1/0435/6525/2771/files/alchemy_leveling_guide_vanilla.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/67862760002.pdf
    • https://cdn.shopify.com/s/files/1/0434/4250/3832/files/97410925835.pdf
    • https://cdn.shopify.com/s/files/1/0432/9842/2934/files/juvukodawidomenepawimoza.pdf
    • https://cdn.shopify.com/s/files/1/0429/9541/7237/files/febalibugakali.pdf
    • https://cdn.shopify.com/s/files/1/0436/9452/2523/files/tidepurevujojazowipizaliv.pdf
    • https://cdn.shopify.com/s/files/1/0434/9257/3334/files/7172896311.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/ranegobifisuxafilalaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/7447/7473/files/nikozimemirij.pdf
    • https://cdn.shopify.com/s/files/1/0431/9232/0161/files/vodilugotetawuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/5597/1492/files/bekejomajuvojezexosaga.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_off0000677f.bin
adf7d355072e356da5112698feb333ce07c26fc7bb1b1ccbc2b869886e362951		 pdf-font-stream PDF embedded font (sfnt) at offset 0x677F 5600 bytes
font_01_sfnt_off00007a73.bin
e87cf019690d9722b78473bdacca8ebfa80c659e2e2abf3ee1b967ee8d2eb516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A73 10664 bytes
font_02_sfnt_off00009e1d.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E1D 4324 bytes

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