Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19d72ed41ff3b11…

MALICIOUS

PDF

55.6 KB Created: 2020-09-02 04:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee229c43d62b1e9817b11928d0d2a8b9 SHA-1: b5dd76663296bf8c51670c41cd5a8ef23aac57e3 SHA-256: f19d72ed41ff3b11e84150917c9640dcf8ec9d82c0843154e98e9f6059c77967
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest an attempt to lure users to external malicious content, likely for phishing or malware distribution.

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/wix?keyword=definicion+de+bloc+de+notas+en+informatica
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/purifekarisivejepu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5041/8847/files/gujubomusofiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/1925/5454/files/48337800249.pdf
    • https://cdn.shopify.com/s/files/1/0436/9825/8074/files/42574545615.pdf
    • https://static.usrfiles.com/ugd/0c41e7_6f4a2a0626084b7ab755b758b56531e3.pdf
    • https://static.usrfiles.com/ugd/2f7815_a68e7a7815e7485eb41ad78ffe464098.pdf
    • https://static.usrfiles.com/ugd/e3ff21_6b744e952de744c99e87bebf86a747a1.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/54487930731.pdf
    • https://cdn.shopify.com/s/files/1/0445/7424/5023/files/market_segmentation_definition.pdf
    • https://cdn.shopify.com/s/files/1/0433/7595/2030/files/kofogoki.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3652/files/duwirovibatiwigazagazod.pdf
    • https://cdn.shopify.com/s/files/1/0434/1484/7655/files/oxford_english_spelling_rules.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/florida_pharmacy_law_review.pdf
    • https://cdn.shopify.com/s/files/1/0433/5714/3205/files/302759344.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_off000090e8.bin
96918a3653bc07b1e9321002f2ee50d6eb80a2ed59e5951e7876bfac5d31cd9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x90E8 5304 bytes
font_01_sfnt_off0000a2e2.bin
457406f4853471474a4c7fdbc0416091548ab8f401c458632191eb92f125db72
pdf-font-stream PDF embedded font (sfnt) at offset 0xA2E2 14936 bytes