Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bf01438abcf758…

MALICIOUS

PDF

45.7 KB Created: 2020-08-04 10:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d48fcd54b6314fc5386cfb0a325378ca SHA-1: 2d44a60b610421d15b29d61e76975522713d3ea3 SHA-256: 40bf01438abcf75857da2ac4eb583aa523a084143123bfdce799ea17e1bbc051
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link redirects to `ttraff.com`. This indicates a link farm or SEO poisoning tactic designed to lure users. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the presence of a malicious redirector URL is the primary indicator of compromise.

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/pify?keyword=autocad+elevation+drawing+pdf
    • http://files.somersetrehab.com/uploads/1/3/2/6/132682833/1207190.pdf
    • http://files.notanothersupermum.com/uploads/1/3/0/7/130775484/434ee3b83f.pdf
    • http://files.clgagolf.org/uploads/1/3/2/6/132681887/8427291.pdf
    • http://files.belab-eurachem2016.com/uploads/1/3/1/6/131606260/3596244.pdf
    • https://cdn.shopify.com/s/files/1/0440/6863/4789/files/mapreduce_framework.pdf
    • https://cdn.shopify.com/s/files/1/0431/9854/6082/files/33298238048.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6322/files/71612082237.pdf
    • https://cdn.shopify.com/s/files/1/0430/7045/5957/files/81879110906.pdf
    • https://cdn.shopify.com/s/files/1/0431/7013/6218/files/sugumiwab.pdf
    • https://cdn.shopify.com/s/files/1/0429/8778/2297/files/99806446319.pdf
    • https://cdn.shopify.com/s/files/1/0427/6027/4087/files/10326931550.pdf
    • https://cdn.shopify.com/s/files/1/0427/9740/0223/files/39950081492.pdf
    • https://cdn.shopify.com/s/files/1/0427/5906/1670/files/94563352431.pdf
    • https://cdn.shopify.com/s/files/1/0431/8189/9944/files/zubasujojasofofu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/12053881847.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/90156160602.pdf
    • https://cdn.shopify.com/s/files/1/0431/9730/0885/files/grade_12_physical_science_module.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_off0000679d.bin
f7d2ad7479ee8671bccee1454c32b52ab4279b0248703c59ef46151b9c32c888		 pdf-font-stream PDF embedded font (sfnt) at offset 0x679D 5168 bytes
font_01_sfnt_off00007951.bin
4a21908be8a5a0e3a77a005c973b129df2de3e36878a86889074062dd2909fed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7951 10068 bytes
font_02_sfnt_off00009bc5.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BC5 4324 bytes

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