Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f0914951d0d12f…

MALICIOUS

PDF

48.2 KB Created: 2020-08-30 22:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87f7ced05bd6bcb3d57f2479d3adf27d SHA-1: 56161f5b8ff2d831f57f0dd5ae4ceee5b9acaaaa SHA-256: 18f0914951d0d12f8bbf69608ea9d589487153595f7e1441a963a008b631c952
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, many of which point to Shopify-hosted PDF files, suggesting a link farm or SEO manipulation tactic. Crucially, one of the embedded URLs, 'https://ttraff.com/wix?keyword=brinell+to+rockwell+c', is identified as malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=brinell+to+rockwell+c
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/8406/9526/files/bengali_movie_panther_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0436/0703/1966/files/98324623251.pdf
    • https://cdn.shopify.com/s/files/1/0438/2051/5488/files/6353749598.pdf
    • https://cdn.shopify.com/s/files/1/0450/0806/0574/files/ccna_dumps_2020_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/4259/5239/files/teguvirowazemobi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6428/5598/files/68891620175.pdf
    • https://cdn.shopify.com/s/files/1/0434/6285/2773/files/47875586659.pdf
    • https://cdn.shopify.com/s/files/1/0437/2883/0625/files/fazixutizevepib.pdf
    • https://cdn.shopify.com/s/files/1/0437/9885/5837/files/vuxinox.pdf
    • https://cdn.shopify.com/s/files/1/0438/4188/0224/files/data_analysis_and_graphics_using_r.pdf
    • https://cdn.shopify.com/s/files/1/0431/5788/0996/files/42347283264.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/babasetaxoguvivowe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0881/0398/files/78576820321.pdf
    • https://cdn.shopify.com/s/files/1/0430/8910/0957/files/niteraninutapolaxinobowit.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/3233300278.pdf
    • https://static.usrfiles.com/ugd/b8c837_0fa239f3bdb440fdab8ffae0ecfc174e.pdf
    • https://static.usrfiles.com/ugd/f7fbc8_3f6830da221a4fc5ba03e491d7b666f2.pdf
    • https://static.usrfiles.com/ugd/271e65_7c80effcf6534fd7a31d83c510078868.pdf
    • https://static.usrfiles.com/ugd/b8c837_10d0b055c36f4579b1d805f4e1d35ce0.pdf
    • https://static.usrfiles.com/ugd/9ec29b_a84c60ebf10e4d82abfa7a77764c23ba.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_off00007c60.bin
32aa201a06350a097f0db54cdab3f27e1097f6af152eaefc8ca2eb1bf01101a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C60 4608 bytes
font_01_sfnt_off00008c32.bin
8588727b7b330b3b5d4908ece858580202dee37bd58deb950e377355be621f96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C32 12524 bytes

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