Malicious PDF — malware analysis report

Static analysis result for SHA-256 112a7ecf8cf964b7…

MALICIOUS

PDF

40.6 KB Created: 2020-08-25 03:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33b57ce6c61d182de1ebab48622ca0cf SHA-1: ff91b603da859b124c0a05810b6a28071e2a10e4 SHA-256: 112a7ecf8cf964b76d809ce11cb3c73f6beb2298e6d75ebc1c68fd15f5bc3342
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 service known to host malicious content. The document body, though partially corrupted, contains text related to essay templates and includes the malicious redirector URL, suggesting a lure to external, potentially harmful resources. The presence of numerous links, including those to Shopify, indicates an attempt to create a link farm or distribute malicious content through disguised resources.

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.cc/pify?keyword=outline+format+for+essays+templates
    • http://files.unalomesoapscandles.net/uploads/1/3/1/3/131379946/fenopoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0443/6181/0076/files/advanced_trainer_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1320/files/lawexiwovida.pdf
    • https://cdn.shopify.com/s/files/1/0432/4907/4336/files/kirunawadekuvidowumitav.pdf
    • https://cdn.shopify.com/s/files/1/0427/7266/0390/files/77896004956.pdf
    • https://cdn.shopify.com/s/files/1/0437/8827/1777/files/37272628450.pdf
    • https://cdn.shopify.com/s/files/1/0428/8672/5799/files/9th_grade_math_problems_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/7401/9740/files/mupawo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2197/6220/files/tozoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/2739/8807/files/tisaniz.pdf
    • https://cdn.shopify.com/s/files/1/0432/8875/6374/files/67815183040.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/71714074233.pdf
    • https://cdn.shopify.com/s/files/1/0438/3444/1890/files/pafuluje.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6331/files/high_fliers_word_whizzle_answers.pdf
    • https://cdn.shopify.com/s/files/1/0439/8697/6926/files/runescape_smithing_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0438/6881/5528/files/10_luck_20_skill.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_off000061cd.bin
b7ab9102156595db007a51c8c741fdb7708e9f7a62646bece3bfc7ac052a339e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61CD 5176 bytes
font_01_sfnt_off00007357.bin
2fef52fc370b5eb84df29dc2f1244a70af1c682723f51061994d0a3b8809b0a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7357 10048 bytes

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