Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9d172f2435e8a8…

MALICIOUS

PDF

41.3 KB Created: 2020-07-30 23:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab652f4b1b14d989016b1b710df1b7d2 SHA-1: 69d5fd9ecd2a6f0f8f8f38da38baee6ac82d0fad SHA-256: fb9d172f2435e8a8f397df4cc7f49754aacf37299d6aeed373bc5d9cfee2d401
150 Risk Score

Malware Insights

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

The PDF contains a high density of external links, many pointing to Shopify domains, suggesting an attempt at SEO poisoning or link farming. One critical heuristic identified a link to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains keywords related to academic resources, reinforcing the lure. The primary attack pattern involves redirecting users to malicious infrastructure via these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.com/pify?keyword=mathematical+statistics+with+applications+7th+edition+solutions+free+pdf
    • http://files.hhsalcorn.org/uploads/1/3/1/4/131408899/waxujal-razim.pdf
    • http://files.voicesofthevalley.co/uploads/1/3/0/9/130969965/mupivaxezepilovamid.pdf
    • http://files.caa4caa.com/uploads/1/3/2/6/132696015/5130860.pdf
    • http://files.mindrawise.com/uploads/1/3/1/3/131383760/5fd0de7cafea60.pdf
    • http://files.domaplasma.com/uploads/1/3/1/1/131164534/gifuwubumip.pdf
    • http://files.voicesofthevalley.co/uploads/1/3/0/9/13096996
    • https://cdn.shopify.com/s/files/1/0429/9233/7059/files/bobadolajegopasidaposobo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5833/0786/files/fuzotazenuvixivali.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/91516183026.pdf
    • https://cdn.shopify.com/s/files/1/0427/7485/5846/files/bepikibezufinases.pdf
    • https://cdn.shopify.com/s/files/1/0428/3881/8982/files/85474408078.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lofexunixepufatomubudabak.pdf
    • https://cdn.shopify.com/s/files/1/0437/7323/1258/files/3576710265.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/43861659067.pdf
    • https://cdn.shopify.com/s/files/1/0439/0053/4952/files/12373606916.pdf
    • https://cdn.shopify.com/s/files/1/0433/5907/6502/files/44027223064.pdf
    • https://cdn.shopify.com/s/files/1/0432/2230/2888/files/78202147975.pdf
    • https://cdn.shopify.com/s/files/1/0435/2281/8200/files/76654149174.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9341/files/34694099583.pdf
    • https://cdn.shopify.com/s/files/1/0436/3524/5214/files/sidizemulezaloveladapeto.pdf
    • https://cdn.shopify.com/s/files/1/0434/3876/8294/files/52445487912.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_off000062ee.bin
be90ca4b7cb15ec0f55461f59e3dfa8fe45238bd8100bc0721dec67a99b6772e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62EE 5452 bytes
font_01_sfnt_off0000756d.bin
b8cb0d9e080bd2c5ba35bff8b2381e512c8bc155ed5fa2e8637461b887576a3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x756D 9784 bytes

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