Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a5da9cd9aa9283…

MALICIOUS

PDF

43.2 KB Created: 2020-08-05 01:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d2b82be663a75b0c34f5e4841e2e63e SHA-1: 058b4a92b361b7fbcdb877e95a036ac640fef019 SHA-256: 39a5da9cd9aa928300bece32ab3998504c36f46464db069a89fc641e644500e5
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a mass of external links, with one critical heuristic identifying a link to a known malicious redirector. The document body, though partially corrupted, contains the same URL found in the critical heuristic, suggesting it is the primary lure. The presence of numerous other PDF links indicates a potential SEO poisoning or link farm strategy to distribute malicious content. No scripts were extracted from this sample.

Heuristics 3

  • 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.
  • 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=cours+d+anglais+americain+pdf
    • http://files.alpineanimalhospital.us/uploads/1/3/1/3/131383954/litozajegadolaxugime.pdf
    • http://files.bergthalmennonitechurch.com/uploads/1/3/2/6/132681783/fefc2e.pdf
    • http://files.gcdastudio.com/uploads/1/3/0/7/130738565/vamepuwes-jagatijemixus.pdf
    • http://files.bergthalmennonite
    • https://cdn.shopify.com/s/files/1/0431/4939/4071/files/nonosexexi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0438/files/how_to_check_ssd_health.pdf
    • https://cdn.shopify.com/s/files/1/0429/6910/4540/files/151284336.pdf
    • https://cdn.shopify.com/s/files/1/0430/6881/7569/files/82595736992.pdf
    • https://cdn.shopify.com/s/files/1/0447/1826/0377/files/fairy_tail_season_1_episode_1.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8709/files/kojijaluni.pdf
    • https://cdn.shopify.com/s/files/1/0434/3762/1404/files/verebofenilajogafuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/8379/2533/files/56275712130.pdf
    • https://cdn.shopify.com/s/files/1/0437/7948/9946/files/volujob.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2864/files/5084791907.pdf
    • https://cdn.shopify.com/s/files/1/0431/9048/5150/files/bufusefe.pdf
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/24956212904.pdf
    • https://cdn.shopify.com/s/files/1/0437/7228/0981/files/dilixakijobexusowomux.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_off00006666.bin
5786e6725b23618533f36252785c25b9d3d251b1f02ba3bdbcdbd50d95d4503b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6666 5380 bytes
font_01_sfnt_off0000789c.bin
729c3bb55553600a2c0be77f49f1250f0201792299ef9654f8d715d63e7a6f3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x789C 11716 bytes

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