Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8481681eb685f27…

MALICIOUS

PDF

56.5 KB Created: 2020-08-13 23:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 356e4fde9ac1edd6c0986aaf851520d9 SHA-1: 23d8a93d9f15f125055ce3347036689fcedfd6eb SHA-256: a8481681eb685f2797c14156e04591c38e13b9a0f9f789ee8966a10995bf6c82
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The document body, though heavily obfuscated, contains the target URL, suggesting a social engineering lure. The ML classifier strongly indicates maliciousness.

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=apollo+11+mission+report+nasa
    • http://dobojo.sf-inked.com/uploads/1/3/1/4/131437421/zopek.pdf
    • http://files.smallpawsbiglove.com/uploads/1/3/1/4/131438616/lubujugizeto.pdf
    • http://files.dalesdesignsonzazzle.com/uploads/1/3/1/6/131607062/risot.pdf
    • https://cdn.shopify.com/s/files/1/0434/3873/5517/files/85713905572.pdf
    • https://cdn.shopify.com/s/files/1/0427/4556/1254/files/45722879155.pdf
    • https://cdn.shopify.com/s/files/1/0434/0439/4646/files/aloe_vera_nombre_cientifico.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/colour_vision_test.pdf
    • https://cdn.shopify.com/s/files/1/0432/8102/3140/files/algebra_sample_problems.pdf
    • https://cdn.shopify.com/s/files/1/0432/6345/9496/files/2002_buel_blast.pdf
    • https://cdn.shopify.com/s/files/1/0434/6603/1257/files/fofuvimozuwotofidezum.pdf
    • https://cdn.shopify.com/s/files/1/0434/9414/6200/files/nokoxegake.pdf
    • https://cdn.shopify.com/s/files/1/0433/5563/5880/files/57997418331.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4637/files/96915871880.pdf
    • https://cdn.shopify.com/s/files/1/0435/0155/1771/files/skyrim_hd_mod.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_off0000a170.bin
d7973053bc88a880377d8c4fc09c8212627737192c3bba940b8068c8416779a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xA170 5004 bytes
font_01_sfnt_off0000b25d.bin
413315ff2d7b1a3670054a3500657b49ba6c4efc517a2543665ea819328578c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xB25D 10024 bytes