Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fae3d7db82e2144…

MALICIOUS

PDF

39.8 KB Created: 2020-08-06 13:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5cfe2cf2c178318819d2e5fa507b20b SHA-1: f36ed621ae3e973166a61601a488534b751ea6a7 SHA-256: 9fae3d7db82e21441004af1fc03a666ff24a78112c84177c176c56b3787a3fe8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body text, though partially corrupted, includes the phrase 'Rugby world cup 2020 wall chart pdf uk', suggesting a lure to entice users to click the malicious link. The ML classifier strongly flagged this PDF as malicious.

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=rugby+world+cup+2020+wall+chart+pdf+uk
    • http://pebadu.onefutureatatime.com/uploads/1/3/1/3/131380600/nobuwupesebo.pdf
    • http://files.ashlandcitizensactioncommittee.org/uploads/1/3/0/7/130776104/perexajeso.pdf
    • http://files.jmcillustration.com/uploads/1/3/1/3/131384113/putiwog_xajurolepavufur_renosisemu_xusarulig.pdf
    • https://cdn.shopify.com/s/files/1/0430/4368/4503/files/wavevexeluf.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/weather_underground_syracuse_ny.pdf
    • https://cdn.shopify.com/s/files/1/0435/9726/7112/files/big_green_egg_cookbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/2898/7547/files/67239308932.pdf
    • https://cdn.shopify.com/s/files/1/0429/6251/8182/files/66168431746.pdf
    • https://cdn.shopify.com/s/files/1/0430/5374/4279/files/79368571967.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/zebuxovezinilu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3772/0733/files/foxodud.pdf
    • https://cdn.shopify.com/s/files/1/0429/6248/5407/files/79142516730.pdf
    • https://cdn.shopify.com/s/files/1/0431/3353/4357/files/cvc_words_printable_flash_cards.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1669/files/waxoguxudukamutuwazilumas.pdf
    • https://cdn.shopify.com/s/files/1/0429/0124/2022/files/bakepuzatiwilagofazire.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_off00005af9.bin
06b1435acc52dc62c1602548c6c5455701ee5e5a39c1ea3c399e6c3a19df4d54
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF9 5916 bytes
font_01_sfnt_off00006f3b.bin
855ef6cc4f444e44115ef02f1eaa5d415e4592c9738424dc0b6429a8d9f5386c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3B 10080 bytes