Malicious PDF — malware analysis report

Static analysis result for SHA-256 36241ce38f057c5e…

MALICIOUS

PDF

38.7 KB Created: 2020-08-12 10:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cca8486f0df8421bfeca37f7284c3f1 SHA-1: 8e0ba5b1d995b185c10450def2f649eedd87e7db SHA-256: 36241ce38f057c5e6ed56cb6c2456f8090e5917e603a3e72ceac20422ea4cf44
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a 'web to pdf google chrome extension'. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF files, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive link.

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=web+to+pdf+google+chrome+extension
    • http://files.pasanity.com/uploads/1/3/1/1/131164168/tezenip.pdf
    • http://files.whitegallowaysofwayby.com/uploads/1/3/0/8/130873907/fewubogukobavel-sixomolimu-mifip.pdf
    • http://files.smellmelongtime.com/uploads/1/3/0/9/130969775/095635825.pdf
    • https://cdn.shopify.com/s/files/1/0432/7456/7833/files/zutokora.pdf
    • https://cdn.shopify.com/s/files/1/0435/4719/7594/files/94635752196.pdf
    • https://cdn.shopify.com/s/files/1/0428/7057/1174/files/69919712138.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73807437975.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78682713185.pdf
    • https://cdn.shopify.com/s/files/1/0431/0981/0327/files/altivar_31_inverter_manual.pdf
    • https://cdn.shopify.com/s/files/1/0439/1829/5195/files/que_es_bailoterapia.pdf
    • https://cdn.shopify.com/s/files/1/0428/1283/3959/files/50463910272.pdf
    • https://cdn.shopify.com/s/files/1/0432/1050/6404/files/28185860704.pdf
    • https://cdn.shopify.com/s/files/1/0432/2862/7108/files/77213189723.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8550/files/bosch_oven_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/6818/6024/files/word_formation_suffixes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mikawewetekiwu.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_off00005710.bin
4fb8b253a39c1afd9f3390cf1df7afac7a50c4df67f649e628b569d5b276e6f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5710 5580 bytes
font_01_sfnt_off000069f2.bin
3388804974249025a9fcfe940661402a8196abba5b4519e71557780aa6c44432
pdf-font-stream PDF embedded font (sfnt) at offset 0x69F2 10496 bytes