Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d519a33da48f63…

MALICIOUS

PDF

87.8 KB Created: 2020-08-04 17:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21aecbfceaaa4e9c0600c1f82579e5b3 SHA-1: ec57e4e4c036519fc7c0b51f21a61d80bc109526 SHA-256: 97d519a33da48f63c280794ba02d1b982ed576481f66b77284d25c3800c7f422
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a known malicious URL, disguised as a search query for 'list of us state capitals pdf'. This indicates a phishing or social engineering attempt to redirect the user to malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL and heuristic firings are sufficient to determine the attack pattern.

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.ru/pify?keyword=list+of+us+state+capitals+pdf
    • http://files.istyleyourevent.com/uploads/1/3/0/7/130739740/5471222.pdf
    • http://files.hillsboroughartshatchery.com/uploads/1/3/1/4/131437504/fopuwegumijuzururube.pdf
    • http://files.castrovilleconservationsociety.net/uploads/1/3/1/6/131606115/3836910.pdf
    • http://files.nanomat-conference.com/uploads/1/3/1/4/131453194/e50ee650.pdf
    • http://renodan.assayjournal.com/uploads/1/3/1/6/131607600/juxosamemekol.pdf
    • https://cdn.shopify.com/s/files/1/0429/4692/0615/files/24110193959.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/wuxopobasomididuximafer.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6384338271.pdf
    • https://cdn.shopify.com/s/files/1/0434/8307/0629/files/78544378355.pdf
    • https://cdn.shopify.com/s/files/1/0429/0471/5427/files/34850980938.pdf
    • https://cdn.shopify.com/s/files/1/0434/0894/9402/files/dark_souls_3_firekeeper_mask.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/50715933094.pdf
    • https://cdn.shopify.com/s/files/1/0429/2981/5705/files/bixexosarilenod.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/mareme.pdf
    • https://cdn.shopify.com/s/files/1/0429/7120/1695/files/zudesuri.pdf
    • https://cdn.shopify.com/s/files/1/0434/6822/6725/files/bexajuti.pdf
    • https://cdn.shopify.com/s/files/1/0434/1979/5623/files/key_curriculum_pres.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/15075136514.pdf
    • https://cdn.shopify.com/s/files/1/0432/5824/9380/files/22453565684.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_off00011af3.bin
50e7e7eb9c72e79b453f57665fc8f156a73b4295c8cdfcf8c5e1cacc0c55849c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF3 4992 bytes
font_01_sfnt_off00012c0b.bin
864863f80cd3037b0057465abc90a36db65b0923262d09eff0c101a8cf71bd71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0B 10992 bytes

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