Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8087149c423649…

MALICIOUS

PDF

45.1 KB Created: 2020-08-25 10:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7be6953cc7055a6fa1ce0e288844df5 SHA-1: 6952274c16c9db6e1ee6e360cbb454c27eb7a7d9 SHA-256: ef8087149c423649f62fad0e816ab74d17ea7f7303cd53de657ee0972e9db5f9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, masquerading as a game guide, which is a common tactic for SEO link farms and malicious redirection. One of the primary links points to a known malicious redirector, and the ML classifier strongly indicates maliciousness. The document body itself is heavily obfuscated but contains the primary malicious URL and several Shopify-hosted PDF links, suggesting a content-luring or SEO-poisoning attack.

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=for+honor+aramusha+guide+pc
    • http://files.vanitasarts.co.uk/uploads/1/3/2/8/132814147/rimezitipisekumume.pdf
    • http://poragok.bingsdsm.com/uploads/1/3/1/3/131398091/zuvizufujuzen.pdf
    • http://zakaga.kaylaseedig.com/uploads/1/3/0/8/130873851/sojiv.pdf
    • http://kuwupun.texasbestbrushes.com/uploads/1/3/1/1/131164250/vajired.pdf
    • https://cdn.shopify.com/s/files/1/0438/6082/0133/files/bauhaus_latin_flipfont_apk_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/2871687645.pdf
    • https://cdn.shopify.com/s/files/1/0437/5085/0714/files/english_to_gujarati_dictionary_free_download_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0449/2158/5831/files/general_wave_equation.pdf
    • https://cdn.shopify.com/s/files/1/0428/9685/1111/files/les_anticoagulants_oraux_directs.pdf
    • https://cdn.shopify.com/s/files/1/0460/3432/1572/files/free_hair_cutting_images.pdf
    • https://cdn.shopify.com/s/files/1/0428/8741/3923/files/91887726145.pdf
    • https://cdn.shopify.com/s/files/1/0435/0902/2886/files/niwovavitepedurelisiva.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6982/files/wezurepijilagutowepafidux.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/xaruvuwak.pdf
    • https://cdn.shopify.com/s/files/1/0435/1007/1448/files/83006042107.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064a1.bin
edd5aada756432aeb88eb3b274bb2053b898a4c3c156142e03ae1da621eb4592		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A1 5408 bytes
font_01_sfnt_off00007696.bin
9cf0936a69a13cc544a6a3f53270f625114b65ecaf30eb73432e9d5e01a5381a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7696 6180 bytes
font_02_sfnt_off00008584.bin
fa67fc4feb70c26747a160f671b8ae5ed34e7b76df2aebf907fca938f6257f49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8584 9868 bytes

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