Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4a40eeff18e03e…

MALICIOUS

PDF

42.9 KB Created: 2020-08-09 08:39:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2beff726109fb4860e2dca5c0520e7a6 SHA-1: cded50f80d81fea84f974a898a46885b7e4d61ce SHA-256: ea4a40eeff18e03e8a78fa249fab37b8f4e6da5632d6e168e92ac1fe1db8d7ed
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with a primary malicious redirector URL identified as https://ttraff.cc/pify?keyword=subordinating+conjunctions+list+pdf+with+examples. This indicates a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to 'subordinating conjunctions list pdf with examples'. The ML classifier strongly supports the malicious verdict.

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/pify?keyword=subordinating+conjunctions+list+pdf+with+examples
    • http://fuzota.prowrestlinghistoricalsociety.com/uploads/1/3/0/8/130874359/249bf5ad354c.pdf
    • http://files.richfielducc.com/uploads/1/3/1/4/131453276/4002672.pdf
    • http://files.homesdomains.com/uploads/1/3/1/8/131871488/873ef.pdf
    • https://cdn.shopify.com/s/files/1/0430/9676/8673/files/xazumixekuvufevep.pdf
    • https://cdn.shopify.com/s/files/1/0433/0710/6462/files/tavazotakekivekokonuval.pdf
    • https://cdn.shopify.com/s/files/1/0435/8003/1135/files/tabokowub.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8580/files/fejumowojoxosunijaruriwu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7127/4146/files/lapagakimogiwamolebar.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/mosowivavidopu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7637/1110/files/jatalobodabina.pdf
    • https://cdn.shopify.com/s/files/1/0434/5053/1990/files/39904335685.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/5_branches_of_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56751463133.pdf
    • https://cdn.shopify.com/s/files/1/0437/2201/4885/files/nivofesevojewuwul.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_off00006709.bin
e96e804fdccb0eb8af9e65a88ca6b902b54d20a303dedb77d25ebb1ce06b1b47
pdf-font-stream PDF embedded font (sfnt) at offset 0x6709 6048 bytes
font_01_sfnt_off00007b8a.bin
16ae25c3b365ad245f9b604207204e36dfb88819c77605a9257d371a31ad1f2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8A 10120 bytes