Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0cb9211d4b5b60d…

MALICIOUS

PDF

41.1 KB Created: 2020-08-23 05:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cae04fc7673f6143c7417af403205b7 SHA-1: 16c72738b20b4446add1907347d0b0954f1815f7 SHA-256: f0cb9211d4b5b60dcf0be254b10559f3055e9887cb7d573c957db1b156ad6b00
152 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 characteristics of a PDF link farm, embedding numerous external links, many of which are hosted on Shopify but some point to potentially malicious domains. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to click on the embedded malicious URL, which then redirects to further malicious infrastructure.

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=balancing+equations+practice+worksheet+class+7
    • http://doviriri.ocsoilny.org/uploads/1/3/0/7/130739227/2092537.pdf
    • http://files.bodyshapeaesthetics.com/uploads/1/3/0/7/130775373/3968404.pdf
    • http://files.fleurdelightflorals.net/uploads/1/3/1/4/131406893/263cd.pdf
    • http://rugip.looselucys.net/uploads/1/3/0/9/130969723/xixamanijadina-dudesagaxilig.pdf
    • http://fidax.extonbury.com/uploads/1/3/0/9/130969873/vixuton.pdf
    • https://cdn.shopify.com/s/files/1/0430/3152/7575/files/27305636248.pdf
    • https://cdn.shopify.com/s/files/1/0435/2147/4714/files/amazing_grace_my_chains_are_gone_chords_d.pdf
    • https://cdn.shopify.com/s/files/1/0428/0533/0083/files/68474731249.pdf
    • https://cdn.shopify.com/s/files/1/0430/9365/5716/files/best_songs_2018_remix.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5570/files/tomuvuvibekefavaruni.pdf
    • https://cdn.shopify.com/s/files/1/0430/7179/9449/files/bumuzejuruzadidizoto.pdf
    • https://cdn.shopify.com/s/files/1/0433/8706/0375/files/detroit_free_press_auto_reporter.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/31006297388.pdf
    • https://cdn.shopify.com/s/files/1/0429/6641/7571/files/puresawavofid.pdf
    • https://cdn.shopify.com/s/files/1/0439/5863/2606/files/vekaxikemikulokipupaw.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_off0000624d.bin
b8e9573ebb210ba0cab9db8112ea866ace043034141540b1d7cda2e4c6d04461
pdf-font-stream PDF embedded font (sfnt) at offset 0x624D 5608 bytes
font_01_sfnt_off00007568.bin
6b673cacc1e001229bbb418a9432e6b899aa5a2190fa23aabeb53ea8fb5c34ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x7568 9940 bytes