Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c5015097cb14ef…

MALICIOUS

PDF

69.5 KB Created: 2020-08-06 10:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef6d43afa21082053be99341d3e3cb64 SHA-1: abf79421ed6efcbb5baeca5f505a683750d4d965 SHA-256: c0c5015097cb14ef215b439ed42debdc6674e8fd26e11a3c59b440edf953b2ad
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a search result for "Ap calculus textbook pdf 10th edition". The PDF also hosts a large number of external links, many pointing to other PDFs on Shopify domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive document title and a malicious URL.

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=ap+calculus+textbook+pdf+10th+edition
    • http://files.somersetcountymemorialpark.com/uploads/1/3/2/6/132695351/tupavepaxawo-sanulagodapox.pdf
    • http://tetokixa.efmlogicalsolutions.com/uploads/1/3/1/1/131164250/nakarajek_mesozeloxi_fuguzixevodonu.pdf
    • http://webaxu.justandsinner.org/uploads/1/3/1/3/131379732/mizozu.pdf
    • http://barimedet.joemalyan.co.uk/uploads/1/3/0/8/130813042/029767992.pdf
    • https://cdn.shopify.com/s/files/1/0430/1442/2687/files/bivugoxove.pdf
    • https://cdn.shopify.com/s/files/1/0431/5270/3645/files/lexus_sc400_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1278/files/jafugaxiguvatubipifi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2273/7830/files/john_deere_d130_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2995/files/talepusaragis.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3964/files/pogop.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6157/files/96763441385.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4465/files/renotix.pdf
    • https://cdn.shopify.com/s/files/1/0429/0917/1879/files/17286311943.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/44255847942.pdf
    • https://cdn.shopify.com/s/files/1/0434/6193/5261/files/zunixox.pdf
    • https://cdn.shopify.com/s/files/1/0437/8230/7989/files/97138524449.pdf
    • https://cdn.shopify.com/s/files/1/0428/8380/9439/files/gevazakomakinatefijoteg.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_off0000c2dd.bin
5d3da1296ce9c3e0817849865d733f928e429970850e48c02d7305a37bea0713		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DD 5600 bytes
font_01_sfnt_off0000d5ee.bin
9fabf57931f637e12168ec5d2ed0a0591565d567ae46cfe33cdd72e1d2faa6a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EE 16096 bytes

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