Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f456fcc3a60af2…

MALICIOUS

PDF

50.7 KB Created: 2020-08-07 05:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b33454c5c51940967b82c0d6f948d0b1 SHA-1: beef4633320d4ce68c3e4317170dd876395c9895 SHA-256: b4f456fcc3a60af2cf7e12be88e788d5aee531a76e82c596fba1f3081bd1c7af
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources disguised as PDF files. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=names+of+animals+and+their+young+ones+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=names+of+animals+and+their+young+ones+pdf
    • http://kuruxem.vzwood.com/uploads/1/3/2/8/132816202/mifubarutanavagojuva.pdf
    • http://files.presesports.com/uploads/1/3/1/3/131398498/pepurolosepinug-tabavuvunexi.pdf
    • http://ruzedam.qutasa.com/uploads/1/3/1/0/131071164/vozokoxe-samuzobami-dalozi.pdf
    • http://kogasufeg.chaleffandrogers.com/uploads/1/3/1/3/131380485/benik-zijixik.pdf
    • https://cdn.shopify.com/s/files/1/0430/7199/6053/files/retaforom.pdf
    • https://cdn.shopify.com/s/files/1/0428/2236/9446/files/vuwonudizilajigotow.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2485/files/conditional_probability_definition.pdf
    • https://cdn.shopify.com/s/files/1/0435/4116/8283/files/79662447198.pdf
    • https://cdn.shopify.com/s/files/1/0431/0640/2453/files/58108447346.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0503/files/67588324989.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3541/files/jemajuvelazuzibupokiboda.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/97626212734.pdf
    • https://cdn.shopify.com/s/files/1/0428/6801/5260/files/67204582207.pdf
    • https://cdn.shopify.com/s/files/1/0439/1642/7419/files/rezufatesuvi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0656/files/54677168950.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/motorboating_merit_badge_pamphlet.pdf
    • https://cdn.shopify.com/s/files/1/0432/3957/1611/files/13766573915.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dd6.bin
92f430f6df1cbcbcb43d04559733251c2c73763a96add4f8a0e006496365d5c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD6 5408 bytes
font_01_sfnt_off00008015.bin
6adb4dc834ce0586447529072f96aab6ef9c583d75279fab666c4868cf85c85c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8015 15308 bytes
font_02_sfnt_off0000afd1.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD1 4324 bytes