Malicious PDF — malware analysis report

Static analysis result for SHA-256 905c7d0e2cb2da8d…

MALICIOUS

PDF

37.4 KB Created: 2020-07-20 03:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a5e4438c65d6478d6b0741a5fea49ce SHA-1: ecdb285a7cd1d734cb5972b66ad08f65ab85ae2a SHA-256: 905c7d0e2cb2da8d17275bdf63a64605a81a5b2464f948bb2007e81f430325dc
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a PDF link farm heuristic, with numerous links hosted on cdn.shopify.com, suggesting an attempt to obscure the ultimate destination or to generate traffic. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'Lenel training manual' and 'wkhtmltopdf', likely serving as a lure.

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.com/wb?keyword=lenel%20training%20manual
    • http://files.friendlylithuania.com/uploads/1/3/0/9/130969592/b4d0c.pdf
    • http://files.euroatlantic-group.com/uploads/1/3/1/8/131858791/c1acd83b270080.pdf
    • http://files.serenitythroughsound.com/uploads/1/3/1/6/131636845/nirawa_relasokoxelusu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4655/2227/files/39368989119.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3358/files/sesotepoxosuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/3001/9229/files/xiwibipokefu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87195604050.pdf
    • https://cdn.shopify.com/s/files/1/0430/4066/9849/files/12545236422.pdf
    • https://wesafizoda.files.wordpress.com/2020/07/pexewabunajasetujutagaper.pdf
    • https://juxolaf.files.wordpress.com/2020/07/fibemelebilukifobopaxuxi.pdf
    • https://kibufolawof.files.wordpress.com/2020/07/67198091271.pdf
    • https://cdn.shopify.com/s/files/1/0433/4705/0661/files/talamubimi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8962/5250/files/2001523869.pdf
    • https://cdn.shopify.com/s/files/1/0428/0877/0726/files/99195928117.pdf
    • https://cdn.shopify.com/s/files/1/0439/0669/5320/files/wifisesimonabebuxovuv.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/90090253732.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3936/files/9960222628.pdf
    • https://cdn.shopify.com/s/files/1/0431/2200/0029/files/39092480944.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gatafuruzakelimosileraji.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_off000059cc.bin
f4f80f26c21faa272d2edb743a85a129c0885ad801e8272e814a7f4af7fe7d21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59CC 4540 bytes
font_01_sfnt_off00006911.bin
3b4a9bab83731ef1aa2266bc8662fcbbf3f6b242d7de0c216d5a96592197dfd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6911 9160 bytes

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