Malicious PDF — malware analysis report

Static analysis result for SHA-256 988f3a54ca67ac73…

MALICIOUS

PDF

47.4 KB Created: 2020-08-30 05:38:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f27c7b2d0b90a3a0f226e5f6ad3aa9e SHA-1: d53e353e25b64b95fa484cc57cd83fd88b3aa640 SHA-256: 988f3a54ca67ac73b605df6d517d7dd8864017dfe9aa3a7552295519fae216a1
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a significant number of embedded links. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.cc/wix?keyword=stream+captain+america+winter+soldier'. Another heuristic noted a large external PDF link farm, with the first URL being 'https://static.usrfiles.com/ugd/4b7290_4848d0230c0647a0aa04a6bd94f6ca77.pdf'. The document body, though heavily obfuscated, also contains these URLs, suggesting a lure to external content.

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/wix?keyword=stream+captain+america+winter+soldier
    • https://static.usrfiles.com/ugd/4b7290_4848d0230c0647a0aa04a6bd94f6ca77.pdf
    • https://static.usrfiles.com/ugd/225520_c8fc947dc6f54007969cd4d5e946a7fa.pdf
    • https://static.usrfiles.com/ugd/b8c837_f38cb052435c4fe7a7880d25155df6cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_6496ba0ea7e0410296fce502a7dc1e01.pdf
    • https://static.usrfiles.com/ugd/5be868_00e6f5504607450ebfd23b4039ceb3b9.pdf
    • https://cdn.shopify.com/s/files/1/0428/8764/3302/files/18730976408.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94430640368.pdf
    • https://cdn.shopify.com/s/files/1/0434/8536/4390/files/36407687551.pdf
    • https://cdn.shopify.com/s/files/1/0436/7984/2457/files/91577846575.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kosetomamevisired.pdf
    • https://cdn.shopify.com/s/files/1/0435/8864/9123/files/demuforeposuropojila.pdf
    • https://cdn.shopify.com/s/files/1/0436/2164/6498/files/les_regles_des_accents_en_francais.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/bisevugisilejozaxogu.pdf
    • https://static.usrfiles.com/ugd/430cb2_329868ac7ca7489eb4f2b74833d2d5e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_9cdc446cb89647cbac8fab006021e742.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd5ef37642bc4873ac13c8510e4a1d63.pdf
    • https://static.usrfiles.com/ugd/6d59ab_f1ef0c65f10042c8bee27daac250793b.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_off00007356.bin
7a036f4c56f766bf6bd64bfd1df817906ec0fd9cc54b50ff0550b2f482bc00f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7356 5412 bytes
font_01_sfnt_off000085a4.bin
bc349f725a9a055302ebc280067633c641f163a2fd4cdfa2b6edfb6b6d683a50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85A4 13440 bytes

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