Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6dc5cc9fea9758b…

MALICIOUS

PDF

39.8 KB Created: 2020-08-10 20:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ffbc67eed7cef3991c8156f8b562123 SHA-1: 03d72d0507e330c8577f6a37415d8d0f0710a13c SHA-256: c6dc5cc9fea9758bff5ec1ba39e088b92af70b157aae6f0d27da744c873e1ced
120 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=adverbs+worksheet+for+grade+3+pdf`. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect users to malicious sites, likely for phishing or malware distribution. The presence of numerous Shopify links, while some are benign, contributes to a link farm strategy to obscure the malicious redirector.

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=adverbs+worksheet+for+grade+3+pdf
    • http://files.nch2.org/uploads/1/3/1/3/131383294/goporamogekavemurus.pdf
    • http://files.westonathletics.net/uploads/1/3/2/6/132681985/wubolaxoj_nipowabugidab_rupulezizev.pdf
    • http://files.lindseybarlagthornton.com/uploads/1/3/1/4/131453904/dasetapoxe.pdf
    • http://files.funmazingrentals.com/uploads/1/3/0/9/130969061/5770617.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/61054549788.pdf
    • https://cdn.shopify.com/s/files/1/0432/1830/5179/files/62970756236.pdf
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/86799131388.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2854/files/auto_body_repair_for_dummies.pdf
    • https://cdn.shopify.com/s/files/1/0435/2871/6439/files/english_words_with_pashto_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0431/0456/7450/files/english_brushup_sixth_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/4349/5842/files/75462816760.pdf
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/30354649901.pdf
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/7691340565.pdf
    • https://cdn.shopify.com/s/files/1/0432/9517/8902/files/rixaludufoxala.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_off00005c83.bin
c334c7ac5cc8114504d76e87740d400ce15e23575191b9ec4471cf6af9728a40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C83 5780 bytes
font_01_sfnt_off00007046.bin
d571cd989d9a4b3f6d53cee0d166a81247af83005db147f2f5eab282dbfe22cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7046 9948 bytes

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