Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf641a3575791441…

MALICIOUS

PDF

49.9 KB Created: 2020-08-18 16:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 089a6f795337b301eea14ff84577913a SHA-1: 4a8f6244c67d3f853284dacbee9939c9253a35f1 SHA-256: bf641a3575791441ee6f18282bfcf6db64ea25bd5823a71778fc34d6d96e540b
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 Shopify domains hosting seemingly benign PDFs, but one critical link redirects to a known malicious infrastructure at 'ttraff.com'. This suggests a link farm designed to obscure the malicious destination and potentially leverage SEO tactics to attract victims. The ML classifier also strongly indicated maliciousness.

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=flex-+tech+fiberglass+sheet+vinyl
    • http://files.shantellstricklanddavis.com/uploads/1/3/2/6/132695519/masosamarebejakuj.pdf
    • http://files.elysekahler.com/uploads/1/3/0/7/130775106/9010121.pdf
    • https://cdn.shopify.com/s/files/1/0431/5978/1538/files/ceptam_09_tech_a_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9898/1030/files/60597662643.pdf
    • https://cdn.shopify.com/s/files/1/0431/8950/2110/files/duzotunefek.pdf
    • https://cdn.shopify.com/s/files/1/0436/2724/9826/files/jimufupanunawobejowu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3975/9255/files/open_sublime_from_terminal_windows.pdf
    • https://cdn.shopify.com/s/files/1/0434/4145/5256/files/present_status_of_ornamental_horticulture.pdf
    • https://cdn.shopify.com/s/files/1/0435/6141/8913/files/juvodepepoxotufapoxabi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7188/files/8117677182.pdf
    • https://cdn.shopify.com/s/files/1/0435/2675/0362/files/wuxemuxemu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9301/5190/files/dedogoneguwogegex.pdf
    • https://cdn.shopify.com/s/files/1/0430/6056/0025/files/5828112061.pdf
    • https://cdn.shopify.com/s/files/1/0436/2534/9273/files/lesuxivo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/21287282402.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071e2.bin
5f1a50b965add9d355a78d8bf7cf7b83a98aa34cce3484ba89090b9a4adc4aca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E2 5180 bytes
font_01_sfnt_off0000838f.bin
f6772c6df327e83bdb2828d87ba904db769c2cd4f0c816a11b0a3e8268b4b684		 pdf-font-stream PDF embedded font (sfnt) at offset 0x838F 12724 bytes
font_02_sfnt_off0000ac80.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC80 4324 bytes

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