Malicious PDF — malware analysis report

Static analysis result for SHA-256 77deb58cbdafe99f…

MALICIOUS

PDF

44.8 KB Created: 2020-07-28 13:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66248b0cdd79a52ec63f02daeb566d36 SHA-1: db25b9d8960656ebbf8664325011e70eba5add5d SHA-256: 77deb58cbdafe99f0375abb33330d478f82810a2343a0313de4fc5ccc852475a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one to a known malicious redirector, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to reference 'adb driver installer asus', a common lure for technical support scams or malware delivery. The presence of embedded URLs and the heuristic firing for malicious redirectors strongly indicate an attempt to drive users to malicious infrastructure.

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=adb+driver+installer+asus
    • http://files.beatricestocks.com/uploads/1/3/1/4/131452872/papajiput.pdf
    • http://files.beaconhillclassical.org/uploads/1/3/2/6/132695932/3350910.pdf
    • http://files.faithinhisblood.org/uploads/1/3/0/7/130775163/9a6b260.pdf
    • http://files.wandahoneycutt.com/uploads/1/3/2/6/132683070/7262559.pdf
    • http://files.gatewayoflight.com/uploads/1/3/1/4/131438280/miturob_dulizuxodifo_xezorigove.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8414/5049/files/83412975280.pdf
    • https://cdn.shopify.com/s/files/1/0428/1086/7871/files/88543817874.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9387/files/18456096399.pdf
    • https://cdn.shopify.com/s/files/1/0432/2508/8168/files/46935056248.pdf
    • https://cdn.shopify.com/s/files/1/0437/5396/3678/files/70776935280.pdf
    • https://cdn.shopify.com/s/files/1/0428/6427/9718/files/kotogegi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4298/7422/files/34243919833.pdf
    • https://cdn.shopify.com/s/files/1/0429/3260/0985/files/82887152953.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4442/files/nejirabapavogorazul.pdf
    • https://cdn.shopify.com/s/files/1/0430/2058/3065/files/nalomijugasu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5508/6742/files/1501951333.pdf
    • https://cdn.shopify.com/s/files/1/0428/5415/4406/files/11258202843.pdf
    • https://cdn.shopify.com/s/files/1/0428/6434/5247/files/2564416252.pdf
    • https://cdn.shopify.com/s/files/1/0434/5554/5497/files/26069184326.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dcc.bin
6edab6ecd04f5c9703bfe9542c0bd438e4cae757a2f981210fdc31ad4a26229e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCC 4780 bytes
font_01_sfnt_off00007e0d.bin
888b4873f66bcfb6af53b0db1472f986da95bc8688812f556c1c141add8c2e5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E0D 12724 bytes

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