Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a737dfa01e373e…

MALICIOUS

PDF

37.5 KB Created: 2020-08-21 12:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f3ca84cb7f43937c137ce681ff54507 SHA-1: 12b25f25b76b4eb27af300597e59e216bf89008c SHA-256: 42a737dfa01e373e83d09b3dfe942f4f613fc8fc43b91ea373acfb43d7d7c819
152 Risk Score

Malware Insights

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

The PDF contains a prominent link to a redirector URL, which is flagged as malicious. The document body text also includes the same search query, suggesting a lure to trick users into clicking the malicious link. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy. No scripts were extracted from this sample.

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=ashes+celine+dion+sheet+music+free
    • http://xokidav.codyraycomposer.com/uploads/1/3/2/7/132741024/5761745.pdf
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/fukamuxubukuxupilusigopu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6857/1294/files/miwix.pdf
    • https://cdn.shopify.com/s/files/1/0433/2892/9960/files/98406888931.pdf
    • https://cdn.shopify.com/s/files/1/0434/1989/3927/files/54956069752.pdf
    • https://cdn.shopify.com/s/files/1/0432/0827/8171/files/53650350657.pdf
    • https://cdn.shopify.com/s/files/1/0427/6980/9575/files/double_sheet_bedding.pdf
    • https://cdn.shopify.com/s/files/1/0437/6815/2216/files/business_proposal_for_website_development.pdf
    • https://cdn.shopify.com/s/files/1/0432/9340/9438/files/fixusepuwo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8333/3785/files/67163057312.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_off000041b9.bin
0c64d822fbccdd3cdc561b978b3ff1e2c7b893dce4842b4eb2472ba8d31a605d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x41B9 5040 bytes
font_01_sfnt_off000052aa.bin
93da6a05938244d818c525b75208417bc9cafe049cf63ac8504dd63c73afd95a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52AA 9764 bytes
font_02_sfnt_off00007463.bin
46d9b83afd797048ab251ddfc9ca9a6db44f3280724c231f6a80a061bcc6fc12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7463 16120 bytes

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