Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f6cff7f00d7b8e…

MALICIOUS

PDF

42.1 KB Created: 2020-08-06 17:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13b6cabb949c4b9c8a83fa2562a1a005 SHA-1: e8422ca4ede3efe75f9767a501366079eeb51bce SHA-256: 85f6cff7f00d7b8ea7019df23ef17996e840afa1241e9739f2485f80f964b4a5
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, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or obfuscated, but the presence of the redirector URL suggests an attempt to lead the user to malicious content, likely for SEO manipulation or to host further malware.

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=wasteland+survival+guide+pdf
    • http://files.mysonnyrae.com/uploads/1/3/1/4/131455621/kolukam_debovok_xunejukofujape_dumusuw.pdf
    • http://files.rockport-pewter.com/uploads/1/3/2/3/132303020/popax.pdf
    • http://files.insightmentalwellness.com/uploads/1/3/2/6/132696483/cbba64ad25.pdf
    • http://pojiwofa.luxeavie.net/uploads/1/3/0/7/130775413/jutimemiwuj_nonoga_garivifejo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/7970273593.pdf
    • https://cdn.shopify.com/s/files/1/0439/9936/3222/files/wobadetilaxigetebigej.pdf
    • https://cdn.shopify.com/s/files/1/0434/7330/5762/files/lijenaturegudigerude.pdf
    • https://cdn.shopify.com/s/files/1/0440/2269/4046/files/nadubukil.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3592/files/7838366865.pdf
    • https://cdn.shopify.com/s/files/1/0432/6542/5570/files/63456575345.pdf
    • https://cdn.shopify.com/s/files/1/0427/8353/9366/files/zebepa.pdf
    • https://cdn.shopify.com/s/files/1/0427/4411/9462/files/xulazufavapifunuxigapa.pdf
    • https://cdn.shopify.com/s/files/1/0428/3301/9047/files/93064069903.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5523/files/5922387050.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4622/files/juzubasixofipugu.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_off00006709.bin
af67b18176b2629ac4c8f08a081d5b71847cc89ae5831738953017d4634e54c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6709 5280 bytes
font_01_sfnt_off00007924.bin
bce31f18560e46de65cca9ba4dcd5f64c12caa959be32b8baba03cf5789298f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7924 10164 bytes