Malicious PDF — malware analysis report

Static analysis result for SHA-256 1394d282c025c246…

MALICIOUS

PDF

40.5 KB Created: 2020-08-29 11:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acdfac155bcdee7d4d7afa474a2697bb SHA-1: 41f12d507f6c242227578a4b113a6a5dcea7349d SHA-256: 1394d282c025c246a732d6a313a043ffdfb99fcfa98221126f0e049b542dfa16
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector service, which is a common tactic for distributing malicious content. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to improve search engine ranking for specific keywords. This suggests a phishing or scam attempt, likely to lead users to a malicious download or exploit page.

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.com/wix?keyword=harry+potter+book+4+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_a5d2d403ed044f8f9992d05c5373d28d.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc3f681fe16c4779989743be29999529.pdf
    • https://static.usrfiles.com/ugd/b8c837_19e102540730479fa24403e4e216ae7d.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ecbdfdbc4174a6387c801116fd50566.pdf
    • https://static.usrfiles.com/ugd/b8c837_392740da09dc486787b40294ec63f472.pdf
    • https://cdn.shopify.com/s/files/1/0431/6105/9477/files/38615660973.pdf
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/musculos_de_la_expresion_facial.pdf
    • https://cdn.shopify.com/s/files/1/0435/9186/0379/files/divide_et_impera_mod_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/5080/2081/files/mcdougal_littell_algebra_2_resource_book_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/4823/8242/files/17642755935.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/kuweropopogodumelenonetiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/2912/6550/files/zarabelusaxofibudisapuve.pdf
    • https://cdn.shopify.com/s/files/1/0432/0811/4340/files/gekujufatakav.pdf
    • https://static.usrfiles.com/ugd/b8c837_f638475c55ef479c915449acb3f40f13.pdf
    • https://static.usrfiles.com/ugd/b8c837_d9650739f6e74c8c9943b45048927cb4.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4364686319d4179aea7819f94929b5d.pdf
    • https://static.usrfiles.com/ugd/b8c837_a45926fb051d41e8aacf8757528a5a29.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_off000060bb.bin
70cfed2a9c99beaaaceb1b6ed7499d74b18ecb6b592d9781bf4d9f612f299ac7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60BB 5180 bytes
font_01_sfnt_off00007279.bin
0ac5b45d8bac7d72ddcfbb5c19d473b86e17124d661e1a1a46a6aa222b97cec8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7279 10144 bytes

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