Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2819db8bd463720…

MALICIOUS

PDF

51.0 KB Created: 2020-08-01 10:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a40a83c32faa56f6e411764ca75236b4 SHA-1: a9d0c014e6b6e445149be63ed08347a108173b60 SHA-256: a2819db8bd4637206a8495f4b8c1c2be1eb54a98e928576449e045fe5a74d14b
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, a technique often used in link farms for SEO manipulation or to distribute malicious content. One critical heuristic identified a link to a known malicious redirector, traff.ru, which likely serves as a gateway to further malicious sites. The document body, though heavily obfuscated, contains the same URL and other PDF links, reinforcing the attack pattern.

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.ru/pify?keyword=what+is+the+latent+learning+theory
    • http://files.skylarkpubl.com/uploads/1/3/1/8/131871907/lewofikiwi_pefivoro_pawifebimijomet.pdf
    • http://files.alexandrajosutton.com/uploads/1/3/2/6/132681164/6211900.pdf
    • http://files.trinitydentalcentre.ca/uploads/1/3/0/7/130775063/nurib.pdf
    • http://files.krisjezakart.com/uploads/1/3/0/7/130775916/5409252.pdf
    • http://files.foothealthpractice.com/uploads/1/3/1/0/131070820/4597796.pdf
    • https://cdn.shopify.com/s/files/1/0431/1344/7581/files/fikolixedesexobav.pdf
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/86079187398.pdf
    • https://cdn.shopify.com/s/files/1/0429/1624/9767/files/27262049480.pdf
    • https://cdn.shopify.com/s/files/1/0433/5193/3078/files/6038339372.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6744/files/34328551126.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23158701460.pdf
    • https://cdn.shopify.com/s/files/1/0434/3313/2184/files/69975246198.pdf
    • https://cdn.shopify.com/s/files/1/0438/1330/6530/files/dudesoxiliwixovun.pdf
    • https://cdn.shopify.com/s/files/1/0438/2638/0960/files/masofun.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/marifurozijuzaledenikegi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2813/5592/files/nowimodaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/1081305616.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_off0000896e.bin
9624672a17397575ed07b97047b5369465d9d3fdd2868d45075f70371594e14d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x896E 5060 bytes
font_01_sfnt_off00009ab2.bin
b58f57c3bebead70ed6959a13d7aeb1d32330e617f9f84e3af6481c14a3134a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AB2 10784 bytes

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