Malicious PDF — malware analysis report

Static analysis result for SHA-256 511dd8f19a45f47f…

MALICIOUS

PDF

54.7 KB Created: 2020-08-11 17:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc523b503e529b9f284bd310e728c956 SHA-1: 46d05c16145453b77123addcc4340474797bbf52 SHA-256: 511dd8f19a45f47f09576434961b5c1d29c046b10744295d553818e5389b9c4e
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, ttraff.ru. The document body, though heavily obfuscated, contains text related to 'Audience analysis in public speaking pdf' and the URL itself, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly flagged this PDF as malicious, and heuristic rules confirm the presence of malicious redirector links and a link farm.

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.ru/pify?keyword=audience+analysis+in+public+speaking+pdf
    • http://files.estellessweetitchblankets.com/uploads/1/3/1/4/131409170/tixavaxanepuluxuvit.pdf
    • http://files.sweetmarcelsocks.com/uploads/1/3/1/4/131452740/fecabaacd4520.pdf
    • http://files.kueadressesdesign.com/uploads/1/3/1/3/131379217/0a71bcc6df0a2c8.pdf
    • http://moponazo.theroadshetraveled.com/uploads/1/3/0/8/130814328/7102710.pdf
    • http://files.kyamas.com/uploads/1/3/0/8/130814594/wobume.pdf
    • https://cdn.shopify.com/s/files/1/0437/8873/0525/files/68445585816.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/cat_416_backhoe_parts_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0323/9835/files/fopivesajawivunivogezis.pdf
    • https://cdn.shopify.com/s/files/1/0430/4365/1741/files/nesemen.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/anestesia_regional_con_ecografia.pdf
    • https://cdn.shopify.com/s/files/1/0429/6451/7023/files/55258762918.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3215656586.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/parisibudipaxetiwori.pdf
    • https://cdn.shopify.com/s/files/1/0435/5453/7624/files/stanley_garage_door_opener_parts.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/muzoguganava.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32177526878.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gejazopemovaro.pdf
    • https://cdn.shopify.com/s/files/1/0437/0087/9515/files/celtic_thunder_ireland_s_call.pdf
    • https://cdn.shopify.com/s/files/1/0435/6374/5441/files/32410999830.pdf
    • https://cdn.shopify.com/s/files/1/0435/2845/4304/files/third_law_of_thermodynamics_example_problems.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_off0000971e.bin
768bbe5135d1c4d0057758de3ddf1368864a966e46178754bbe3fdf78d726c05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x971E 5520 bytes
font_01_sfnt_off0000a9f7.bin
d12e8162b1505023724be66f57c8f720aac4d03338da5ad6f16da31e724dd3a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9F7 10300 bytes

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