Malicious PDF — malware analysis report

Static analysis result for SHA-256 3890115ae2f1e205…

MALICIOUS

PDF

40.9 KB Created: 2020-07-12 00:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1007c2b87b9d6c58b586f50f5b9fe5e9 SHA-1: ca84e0750d924cb2f2f0627ba153bfe1d136873a SHA-256: 3890115ae2f1e2053dd8d19c670130e7f4b9d9c2aae77d344ace750aeb99d218
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/wb?keyword=double%20acting%20reciprocating%20compressor%20pdf'. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of numerous links and the specific redirector URL strongly suggest a phishing or malware distribution attempt.

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/wb?keyword=double%20acting%20reciprocating%20compressor%20pdf
    • http://files.dewdropsperch.com/uploads/1/3/1/6/131637385/letaz-senukabuwalibin-domok.pdf
    • http://files.languagesafrica.com/uploads/1/3/1/6/131606550/sizejagetod.pdf
    • http://files.saborlatinotacuari.com/uploads/1/3/1/4/131437889/2675522.pdf
    • https://zepijubaxiku.files.wordpress.com/2020/07/58328599169.pdf
    • https://tekafopu.files.wordpress.com/2020/07/vimulilodojakurejotu.pdf
    • https://nutikiro.files.wordpress.com/2020/07/33237603868.pdf
    • https://wemekuwi606608615.files.wordpress.com/2020/07/64628262215.pdf
    • https://tedazusalutu.files.wordpress.com/2020/06/20912323657.pdf
    • https://dadikopur.files.wordpress.com/2020/07/tufidewenitomimiwoniridu.pdf
    • https://guremev.files.wordpress.com/2020/06/94066746754.pdf
    • https://bizesipu.files.wordpress.com/2020/06/tivubarufegowokijofakuxir.pdf
    • https://xexeloxogiz.files.wordpress.com/2020/06/90328451424.pdf
    • https://cdn.shopify.com/s/files/1/0429/6101/0842/files/satevakekavamevin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12509012650.pdf
    • https://cdn.shopify.com/s/files/1/0430/7261/8657/files/folona.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/topevigujofolavab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20745245188.pdf
    • https://cdn.shopify.com/s/files/1/0430/5027/0869/files/67941320751.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_off0000623c.bin
9818c4cdd052b783f18d1016eb47266517f8e1cd5643c2ac12b7499cb77559b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x623C 5496 bytes
font_01_sfnt_off000074ce.bin
5bb3aa4af423ca03e5774391f356767b666ad07828a78abd7e37863b3d63e725		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74CE 9784 bytes

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