Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e26887ff5b8217e…

MALICIOUS

PDF

39.9 KB Created: 2020-08-07 07:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acd92ee4ad5e18a2003cc392e9664471 SHA-1: 3fdf2ed0ee10896faadc412a873153fc6975fa2b SHA-256: 6e26887ff5b8217e92ca1530d2daa6802d8c66e1537abc5e72e05ef88761aae3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one to a known malicious redirector at `https://ttraff.com/pify?keyword=apa+style+research+paper+sample+pdf`. The document body, though heavily obfuscated, contains references to this URL and other Shopify-hosted PDF files, suggesting a link farm or SEO poisoning tactic. 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/pify?keyword=apa+style+research+paper+sample+pdf
    • http://files.subjectiveself.net/uploads/1/3/0/7/130740130/66fb429a2b.pdf
    • http://bewagofid.lisabaudry.com/uploads/1/3/0/7/130775734/995081.pdf
    • http://files.chefjohnfolseevents.com/uploads/1/3/1/6/131636807/7412793.pdf
    • http://files.missmollysmemoriesphotography.com/uploads/1/3/0/8/130814611/376cf2.pdf
    • http://files.wildphlowerwellness.com/uploads/1/3/0/9/130969580/961115.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/ogg_to_wav.pdf
    • https://cdn.shopify.com/s/files/1/0436/0096/9896/files/wamamemezobemu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9303/3117/files/doleposuvakepowusajame.pdf
    • https://cdn.shopify.com/s/files/1/0433/1359/4526/files/nomefopesukudeb.pdf
    • https://cdn.shopify.com/s/files/1/0447/8930/1409/files/resize_file_to_200kb_online_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7384/6952/files/27375992469.pdf
    • https://cdn.shopify.com/s/files/1/0431/0073/3596/files/rawijerin.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/cursor_io_hack.pdf
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/jekuvawutavalezekolilu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8334/2748/files/ganigob.pdf
    • https://cdn.shopify.com/s/files/1/0435/3196/0474/files/20385842882.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_off00005f25.bin
07cbb5384792f0b29428449d656325b2aaa029dfcbbade0fe760aeec18a3643f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F25 5484 bytes
font_01_sfnt_off000071a9.bin
45369e8101b8502868380fe19278ab1053cfecd134aeaff5e3bc5f949b99a9f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x71A9 9644 bytes