Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ce811ec099f253…

MALICIOUS

PDF

35.1 KB Created: 2020-07-08 16:40:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05aa191b794e16deece8feb69e916450 SHA-1: 5f0db58eb6dd8e8a0318bba34488d427118ff775 SHA-256: 13ce811ec099f2536681705c47a0a95de254ccfa919a9017de099a19b84edfa6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many of which point to known malicious redirector infrastructure or are part of a link farm designed for SEO manipulation. The document body explicitly mentions "Convert picture pdf to word online" and includes the malicious URLs, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=convert+picture+pdf+to+word+online
    • http://files.marydanroth.com/uploads/1/3/1/3/131384771/340cfc127.pdf
    • http://files.creditriskanalytics.net/uploads/1/3/1/6/131637325/3748591.pdf
    • http://files.myfiorella.com/uploads/1/3/2/7/132740398/0c08d7c51b.pdf
    • http://files.comtecwash.com/uploads/1/3/0/7/130739658/taputa-tugikituwatoja.pdf
    • http://files.immunenations.com/uploads/1/3/1/0/131070116/2aa56f6ef126617.pdf
    • http://files.updatescentral.com/uploads/1/3/1/3/131384018/fotimiva_nidanu_gibuvidedavade.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://defunudedi.files.wordpress.com/2020/06/82619149361.pdf
    • https://movulixalip549256262.files.wordpress.com/2020/07/sezuredesegikuz.pdf
    • https://xanojebukeki525275366.files.wordpress.com/2020/06/51162845004.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pekazojifedabefotekufof.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/riginijulu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wojilezufaguxulidumusad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53607129813.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93861148098.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9284441163.pdf?v=1594212706
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d65.bin
a3a985f66871172feae685d64b6355a42a3b09d3e3a8879b9f6ac3dd4d69269b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D65 4816 bytes
font_01_sfnt_off00005deb.bin
da6c7c7f2f0d20e8a5aa9628f98a4ee8fd5110b245e1b2fa5a25ff97ddaafa15
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEB 9852 bytes