Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bbabb24382e6838…

MALICIOUS

PDF

50.7 KB Created: 2020-10-22 20:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 024dd50f518b2f0391fd07174be0813e SHA-1: 2899c4de608b267d4de71c28b9cff30d61cb5239 SHA-256: 2bbabb24382e68382834dbdbe930676b8257cde153f25d21377aafc653bf8ec8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains a URL similar to the identified malicious redirector, suggesting a lure to external malicious content. The presence of a large number of external PDF links points towards SEO manipulation or a link farm tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://gettraff.ru/wb?keyword=tissot%20pr50%20titanium%20seven%20user%20manual
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/e9ff54.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/1696278.pdf
    • https://tadeganerusoza.weebly.com/uploads/1/3/1/4/131438541/3811074.pdf
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/7271212.pdf
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/5711090.pdf
    • https://nulixedupalaz.weebly.com/uploads/1/3/0/7/130739510/muxotevebuvogo.pdf
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/5433849.pdf
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/8358254.pdf
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/zegolanizu-bilefatesab-koxolez.pdf
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/furijin.pdf
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/6658489.pdf
    • https://sutogibigasoju.weebly.com/uploads/1/3/1/0/131070189/6289012.pdf
    • https://zizuralozirufu.weebly.com/uploads/1/3/1/4/131483034/kubuvevizabibujaz.pdf
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/1418157.pdf
    • https://xufiwelak.weebly.com/uploads/1/3/1/1/131164558/3392954.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0479/8087/1850/files/nandroid_backup_using_pc.pdf
    • https://cdn.shopify.com/s/files/1/0437/3449/9493/files/advanced_sight_singing_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0486/0788/7518/files/92682230403.pdf
    • https://cdn.shopify.com/s/files/1/0501/9936/3764/files/79725454673.pdf
    • https://cdn.shopify.com/s/files/1/0434/3290/2806/files/administrative_law_outline_funk.pdf
    • https://cdn.shopify.com/s/files/1/0493/4280/8218/files/wigen.pdf
    • https://cdn.shopify.com/s/files/1/0430/6845/7113/files/rekakekovexom.pdf
    • https://cdn.shopify.com/s/files/1/0484/2022/5176/files/bufekedesamuw.pdf
    • https://cdn.shopify.com/s/files/1/0497/5978/1023/files/dd_3.5_rogue_handbook.pdf
    • https://s3.amazonaws.com/susopuzupure/fat_caliper_chart.pdf
    • https://s3.amazonaws.com/subud/at_dev_english_to_bengali_dictionary_free_download.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_off0000735e.bin
f7c43fb8781e9b78c9838ea97926d61e678e64a58c68d21f003f60ba88c6b02d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x735E 4000 bytes
font_01_sfnt_off0000811c.bin
4866fad26a8a1066c254f18e984cafe27c30a034496298651edd3ed1f2477a97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x811C 5240 bytes
font_02_sfnt_off000092dc.bin
a1c9e66047312b35e475305576b4acdd0d33ce8734cb4bf66a1c7e7720e5cade		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92DC 12420 bytes

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