Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a80384c2fd15a9…

MALICIOUS

PDF

33.1 KB Created: 2020-09-16 17:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e783d042633674fa8de7d29f6d90e1a SHA-1: a119c19b1435f1a013b1f50de0fc998f986f422d SHA-256: 25a80384c2fd15a9f8c3a034b849e95bb7d69bb34b24a95192434b4a274d1020
152 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of embedded links, indicating a link farm. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is ttraff.me, which is likely used to redirect users to a phishing or malware distribution site. The document body contains garbled text but includes the malicious URL and several other embedded PDF links.

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.me/wix?keyword=provas+da+uva+comentadas
    • http://files.makergirlz.org/uploads/1/3/0/7/130739564/05095d01439.pdf
    • http://vazili.nhcohousing.com/uploads/1/3/1/0/131070705/nagetanokew_fusumaleneli.pdf
    • https://cdn.shopify.com/s/files/1/0428/5959/3894/files/xamebidabuwojuze.pdf
    • https://cdn.shopify.com/s/files/1/0434/5459/5224/files/robunivajakitu.pdf
    • https://cdn.shopify.com/s/files/1/0440/8036/5720/files/fobibixiwarupodo.pdf
    • https://f165d463-b1b0-4b8b-a3f9-1102f3e0c2a0.filesusr.com/ugd/d2759c_ca37865ee71544aa83eec0b781d15581.pdf?index=true
    • https://15783b36-dfb9-4985-98aa-aacf8cafcc27.filesusr.com/ugd/f08e01_4846cf75986a4b6cb8384929c66e3659.pdf?index=true
    • https://281c2068-2cb7-4bea-aa25-8af251d63042.filesusr.com/ugd/49f5ef_226430cc219e4bb7944fbf07e017296b.pdf?index=true
    • https://e8598a7e-3f5b-40db-a920-2e1eebc7e54e.filesusr.com/ugd/4c7633_d7463374f38649e39a156924a5883bb8.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0463/3709/7889/files/likes_and_dislikes_worksheet_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0447/9670/6967/files/wijekijuvofe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepikopu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8187/5104/files/czasy_angielski_wiczenia_szkoa_podstawowa.pdf
    • https://cdn.shopify.com/s/files/1/0436/3229/6089/files/accounting_concepts_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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000041cc.bin
35db47e063f7c5588bcd60f975775c0f87d760d298a5b8e4c706193ea86e2fb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x41CC 5112 bytes
font_01_sfnt_off0000531f.bin
3d2395437a18c2a413b6af2effa9b6057aad8ec5225edf73e65ef1929de971aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x531F 11248 bytes

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