Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fce6455f822a97…

MALICIOUS

PDF

44.8 KB Created: 2020-08-31 13:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f962b63334f92511b394a6191ace5201 SHA-1: 210fbacaeb6c01bc90d9301198631eb5753cb6d7 SHA-256: a8fce6455f822a97cd79484601c2d165052ccd455aef8bac9c81c725f8ca11ed
152 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains numerous embedded links. One of these links, 'https://ttraff.ru/wix?keyword=all+of+the+following+are+considerati', points to known malicious redirector infrastructure. The document also exhibits characteristics of a PDF link farm, with many links to external PDF files, suggesting a potential SEO manipulation or traffic generation scheme. No scripts were extracted, and the document body is largely unreadable binary data.

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/wix?keyword=all+of+the+following+are+considerati
    • https://static.usrfiles.com/ugd/b8c837_85b29df8fdac477abceb403d37dcb543.pdf
    • https://static.usrfiles.com/ugd/c1108c_0036e4a7fbdd4dfe9415f6a234da12de.pdf
    • https://static.usrfiles.com/ugd/70a38d_6cd18dbe64284d50ae21c42eba64e6c5.pdf
    • https://static.usrfiles.com/ugd/18f527_976d14e1636c4b9c85c3d34a13899c7a.pdf
    • https://static.usrfiles.com/ugd/5926b4_fc1dfd923aed46219b6f5a7e7ee55e22.pdf
    • https://static.usrfiles.com/ugd/5b9365_4e890e40befe4e73b1877964bbcccbab.pdf
    • https://static.usrfiles.com/ugd/5bb01c_400b334388e641229dc5a8cd1f4294e1.pdf
    • https://static.usrfiles.com/ugd/d55797_db104cd5d6a84423a4597516a493db7d.pdf
    • https://static.usrfiles.com/ugd/c3f59f_90b7669c49e84aefb5e1314b95df17d8.pdf
    • https://static.usrfiles.com/ugd/9219f8_26c5784895f74a5db498b4a087dd767d.pdf
    • https://static.usrfiles.com/ugd/158fb9_f8d3c53886ed499eb5eabc8222c0b9b6.pdf
    • https://static.usrfiles.com/ugd/191a6d_e8ddad94fb1d4b2d95d60245a7c90cfb.pdf
    • https://cdn.shopify.com/s/files/1/0435/9258/1288/files/counter_strike_1.6_kurulumsuz.pdf
    • https://cdn.shopify.com/s/files/1/0464/4788/6504/files/ejercicios_resueltos_economia_4_eso_editex.pdf
    • https://cdn.shopify.com/s/files/1/0430/3018/4098/files/79258554155.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5757/files/maleju.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000702c.bin
13d753ceb0da3901d6e7696f2ec457fbf5658f9f42d07418be6558d0bec4885c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x702C 5364 bytes
font_01_sfnt_off0000827a.bin
784e9dfdabd9d0c1865858cfcc223c68901023e74ae5f6b7ff022530b8eddc2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x827A 10492 bytes

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