Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c298ff6c77471b…

MALICIOUS

PDF

46.8 KB Created: 2020-08-06 23:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8ea2d44816729c8756d6cc25e44beef SHA-1: d8aa9bc2c3677b8250cf667c1ff080b2f6120c0e SHA-256: 17c298ff6c77471b1a1b8857206a1245c77d773f97344b8ee4217d8cdadcf2f6
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, masquerading as a job application CV sample. This is supported by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic and the embedded URL. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document's structure and embedded links suggest a phishing or redirection attempt.

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=cv+sample+for+job+application+pdf
    • http://files.englishchurchtokyo.net/uploads/1/3/0/9/130969448/f604b.pdf
    • http://files.aspectsandangles.com/uploads/1/3/1/0/131070202/2827e7b6afb5.pdf
    • http://files.marthasvineyardgardenclub.org/uploads/1/3/1/3/131381555/nimusunetasazuvex.pdf
    • http://files.tkfirearmstulare.com/uploads/1/3/0/8/130874329/2855682.pdf
    • http://files.pettyharbourmaddoxcove.ca/uploads/1/3/0/8/130874518/9604094.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/1223/5174/files/fuxuporarulanabobamaterox.pdf
    • https://cdn.shopify.com/s/files/1/0429/1212/0998/files/79613944551.pdf
    • https://cdn.shopify.com/s/files/1/0429/1752/7715/files/66114735987.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5013/files/52861755327.pdf
    • https://cdn.shopify.com/s/files/1/0437/3128/8216/files/98559888707.pdf
    • https://cdn.shopify.com/s/files/1/0436/1935/2740/files/48230839634.pdf
    • https://cdn.shopify.com/s/files/1/0431/5791/3749/files/3979171752.pdf
    • https://cdn.shopify.com/s/files/1/0430/5344/9367/files/13007052108.pdf
    • https://cdn.shopify.com/s/files/1/0438/2903/5158/files/76860811501.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a0f.bin
6a68a1e0379b679f411bd0df11710ad20a5b90a1402c339d644a23043370cfe1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0F 5388 bytes
font_01_sfnt_off00007c4e.bin
2a83c15801ca1362bd29884cc6928e99c6296625da246da5fb2befa51560f823
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C4E 10348 bytes
font_02_sfnt_off00009f91.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F91 4324 bytes