Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c58426ccf0e8f04…

MALICIOUS

PDF

41.6 KB Created: 2020-08-08 17:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c5979bce338730f65bf7ddc2ecb57dc SHA-1: ae053ff6b48a8b8febc4f6f46d5b948ecec528de SHA-256: 8c58426ccf0e8f048fdb8994b86b02c08b566767d70d68f085d88cd5d7c6fb4f
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely intended to lead the user to a phishing or malware download site. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to a calendar. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content.

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.cc/pify?keyword=calendario+mundial+rusia+2020+costa+rica+pdf
    • http://files.agnescakes.net/uploads/1/3/1/4/131454317/2428662.pdf
    • http://files.amesburywest.org/uploads/1/3/1/3/131380005/5733449.pdf
    • http://files.raytannerfoundation.org/uploads/1/3/0/9/130969356/9194210.pdf
    • http://files.joycedonahuelive.com/uploads/1/3/1/0/131070112/bugaj-zewaporukojis-fakekamozekomi-jifivogosara.pdf
    • http://files.auntbettyskitchen.com/uploads/1/3/2/6/132681513/f5d6d26e25aba48.pdf
    • https://cdn.shopify.com/s/files/1/0436/9124/5733/files/wwe_13_roster.pdf
    • https://cdn.shopify.com/s/files/1/0429/0736/9639/files/luwuturag.pdf
    • https://cdn.shopify.com/s/files/1/0430/3591/8489/files/pokawaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/3961/3347/files/bulaklak_sa_city_jail.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/29755738239.pdf
    • https://cdn.shopify.com/s/files/1/0438/2208/8354/files/oral_carcinogenesis.pdf
    • https://cdn.shopify.com/s/files/1/0429/7129/9999/files/tigaguloraz.pdf
    • https://cdn.shopify.com/s/files/1/0429/7857/4490/files/jesabuxadiliwud.pdf
    • https://cdn.shopify.com/s/files/1/0432/8521/7436/files/guajira_santana.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_off000062f5.bin
2d79aefa3a73ae749f5538cb51b6416783134c703bb104b3abea86829e92b7fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x62F5 5480 bytes
font_01_sfnt_off0000757b.bin
295474364f17d618373298d91756aa088643fd4c88662e4bde3864864b6d6673
pdf-font-stream PDF embedded font (sfnt) at offset 0x757B 11096 bytes