Malicious PDF — malware analysis report

Static analysis result for SHA-256 66316eba832d5342…

MALICIOUS

PDF

45.6 KB Created: 2020-07-28 06:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39bd7c5d0752f7d338c16ae31a224057 SHA-1: a7b39fcda856f57d8452dd6b8eee5abc1816584d SHA-256: 66316eba832d5342f6e43bd3f296ac54034a670528401d3bd16381f292e70b8a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous links suggests an attempt to lure the user to external, potentially malicious, sites for further exploitation or phishing. The document body appears to be malformed or truncated, providing no clear textual lure.

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.ru/pify?keyword=double+and+half+angle+identities+worksheet+answers
    • http://files.lionessprayer.com/uploads/1/3/1/3/131398347/3233586.pdf
    • http://files.futurefitness4allofyou.com/uploads/1/3/0/7/130775592/duragozunilisu_navaxigifigisep_kodalo_kejonetevotapo.pdf
    • http://files.usfncnw.org/uploads/1/3/0/9/130969080/pakukogemijumuvoz.pdf
    • http://files.greyriderfordixiecom.com/uploads/1/3/0/7/130738752/zekuwuvotopu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tiwimuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0489/5143/files/nivodatav.pdf
    • https://cdn.shopify.com/s/files/1/0440/9350/5688/files/92464879635.pdf
    • https://cdn.shopify.com/s/files/1/0428/1673/3340/files/kafixezedasujudex.pdf
    • https://cdn.shopify.com/s/files/1/0435/9038/5823/files/97023021569.pdf
    • https://cdn.shopify.com/s/files/1/0437/7182/2229/files/jasurojefezupejon.pdf
    • https://cdn.shopify.com/s/files/1/0429/2775/1321/files/rukojebutitutuvavezofaxud.pdf
    • https://cdn.shopify.com/s/files/1/0437/2591/4262/files/tukonepuligo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0342/0570/files/6592138536.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6232/files/27560823297.pdf
    • https://cdn.shopify.com/s/files/1/0437/9744/6818/files/vorelitudiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/6808/7701/files/marudof.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/satofekefekuwozavobijogut.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072bf.bin
cfd498930ba8df958d64f70b9aff26abcabbfce514a755134c8f7cc51eb11b1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72BF 5348 bytes
font_01_sfnt_off000084f4.bin
acab499e6ed0e1e92cf7bae0a4d6f5762dbe32e85700669cd6ec370e93a4811e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84F4 10532 bytes

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