Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e6509ca001b2a4…

MALICIOUS

PDF

39.3 KB Created: 2020-08-17 01:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f30cd3aad34c69d0e2dd4041608c2379 SHA-1: 196f6ac34149fa60433bf61d51de7fb0d65f970f SHA-256: 52e6509ca001b2a4cf8d7961a319a58a6f6b5caee7265928304ffb4b10ab24ea
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'themeforest html templates responsive' and the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent. The presence of a link farm and a critical heuristic firing for malicious redirectors strongly indicates a phishing or redirection attempt.

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.cc/pify?keyword=themeforest+html+templates+responsive
    • http://files.radio.10losttribes.com/uploads/1/3/0/7/130775983/ec96bfc21.pdf
    • http://wutar.nubim.net/uploads/1/3/1/8/131856145/getolarusimub.pdf
    • http://files.wallyplastics.com/uploads/1/3/0/8/130814205/wudirobimog.pdf
    • http://files.stephenjonesjewellers.com/uploads/1/3/1/6/131606490/kurerokipudopobo.pdf
    • https://cdn.shopify.com/s/files/1/0435/4729/5898/files/247_bridge_game.pdf
    • https://cdn.shopify.com/s/files/1/0438/5511/8501/files/deposetatuzubuxomuvejo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2725/9811/files/mapuduja.pdf
    • https://cdn.shopify.com/s/files/1/0439/2160/4763/files/bewav.pdf
    • https://cdn.shopify.com/s/files/1/0431/0102/8503/files/44382497451.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6488/files/encyclopedia_of_chart_patterns_portugues.pdf
    • https://cdn.shopify.com/s/files/1/0432/2980/6759/files/50595068520.pdf
    • https://cdn.shopify.com/s/files/1/0430/7045/5965/files/rizepu.pdf
    • https://cdn.shopify.com/s/files/1/0441/3535/0424/files/vivipesujofiferodefi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0689/3985/files/53124048163.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/kazusevofuxafirarilaw.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_off00005d01.bin
cfe93c2d0333905f834b86ae3653b85ee3bd72f9c9bae5b93396ee4518d13545
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D01 5148 bytes
font_01_sfnt_off00006e65.bin
21cdfbbcba24794a871b14e0245d81a7f3c1fccd9b82f7fd2f13437747ad0350
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E65 9940 bytes