Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd70161a379c62f…

MALICIOUS

PDF

42.8 KB Created: 2020-08-11 14:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6d1a4f5e38c94ee8a7cdb3b9b177c5d SHA-1: 40a7393ca91880cbf04cc559694e0b5c3958aab5 SHA-256: dcd70161a379c62f3ea49b4708f72c728b877655ed2f2519ab3b420042356bb9
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=amparito+roca+score+pdf', which is likely used to redirect users to a malicious site. The ML classifier also strongly indicated maliciousness.

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=amparito+roca+score+pdf
    • http://files.janabrodkin.com/uploads/1/3/1/4/131453595/c2e8aa3b6c.pdf
    • http://files.jollyduke.com/uploads/1/3/0/7/130775205/6244228.pdf
    • http://files.autisticadults.org/uploads/1/3/1/3/131381464/lidawuneguki-vunajom.pdf
    • http://files.paulabeasty.com/uploads/1/3/2/7/132740930/8093100.pdf
    • http://butoj.z-furniture.com/uploads/1/3/0/7/130775868/9889474.pdf
    • https://cdn.shopify.com/s/files/1/0430/0665/6666/files/64829410112.pdf
    • https://cdn.shopify.com/s/files/1/0433/5439/0687/files/51974951895.pdf
    • https://cdn.shopify.com/s/files/1/0427/9464/7719/files/3112905592.pdf
    • https://cdn.shopify.com/s/files/1/0429/3325/6345/files/nixapamosowibof.pdf
    • https://cdn.shopify.com/s/files/1/0429/0212/6755/files/89927989500.pdf
    • https://cdn.shopify.com/s/files/1/0432/4743/5940/files/jixoximijo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7226/6150/files/3528580863.pdf
    • https://cdn.shopify.com/s/files/1/0431/0761/4882/files/borubumaxajuxupuwuwor.pdf
    • https://cdn.shopify.com/s/files/1/0429/5737/3589/files/46343670304.pdf
    • https://cdn.shopify.com/s/files/1/0428/9904/6553/files/xoguwifijowegopoboxosudog.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/tebutixawejebabuberojile.pdf
    • https://cdn.shopify.com/s/files/1/0428/0611/6511/files/27452338033.pdf
    • https://cdn.shopify.com/s/files/1/0433/7644/3543/files/wuwegobowomusuzuviwuv.pdf
    • https://cdn.shopify.com/s/files/1/0436/7086/4025/files/26634656162.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000548f.bin
2b681a8f3c929f1ca1bd4590438553ed944f216eabf82c0201f152080b548077		 pdf-font-stream PDF embedded font (sfnt) at offset 0x548F 5260 bytes
font_01_sfnt_off0000664d.bin
c2cd8670372c85cec5f52af23337a09b2140e71f41cbc1136b19bfbb1efff282		 pdf-font-stream PDF embedded font (sfnt) at offset 0x664D 10044 bytes
font_02_sfnt_off000088f0.bin
73e2bae015806fcbcea00a5e77fef36cf57312733aebee32ba98308b5ce41d75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88F0 16120 bytes

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