Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5d7be2e6bca091…

MALICIOUS

PDF

39.5 KB Created: 2020-08-22 06:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7a8c69bc231a86a95d61eed4e48d630 SHA-1: cdcb3ec9e333918cf035c16b60b6687991fb4ba8 SHA-256: cf5d7be2e6bca091a2619c3ed074592ebf0b17cfb0c0336839a9be50e2afc880
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning attack designed to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious verdict. No scripts were extracted, limiting the analysis of specific execution chains.

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=assistant+google+apk+mirror
    • http://files.guttenbergfiredept.com/uploads/1/3/0/8/130873983/c27818a7f87.pdf
    • http://files.stephendoughtonfoundation.org/uploads/1/3/1/4/131406841/4756f72b16.pdf
    • http://xujunesot.annwnfoundation.com/uploads/1/3/1/4/131409035/9470600.pdf
    • http://pavovuju.kemmettelectric.com/uploads/1/3/0/7/130776485/kubedozi-genosifinef-sopakibiwunok.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38684703775.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1289/files/bed_cet_question_paper_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/1311/0951/files/google_chrome_para_ubuntu_32_bits.pdf
    • https://cdn.shopify.com/s/files/1/0430/9050/9973/files/carcinoma_de_clulas_escamosas_pulmo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6710/5687/files/online_shopping_presentation_ppt_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/3164/8661/files/1865252702.pdf
    • https://cdn.shopify.com/s/files/1/0438/4853/2128/files/fenalarubaluxubumer.pdf
    • https://cdn.shopify.com/s/files/1/0431/8570/1025/files/zolibifesubuneguko.pdf
    • https://cdn.shopify.com/s/files/1/0434/8438/1337/files/57501166151.pdf
    • https://cdn.shopify.com/s/files/1/0433/5910/9279/files/vufafefesum.pdf
    • https://cdn.shopify.com/s/files/1/0429/6795/7660/files/tijojoteguve.pdf
    • https://cdn.shopify.com/s/files/1/0437/1405/2247/files/bmw_x5_manual.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_off00005d1d.bin
021fe0b8cdc387c7b2072d5639b012feeb2d8da9d8807a5fb8ad4380ec1af47c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D1D 5192 bytes
font_01_sfnt_off00006ead.bin
40153af67879b6d345ba682be27b640441e7a3c1e3c696faf153caedfb32cfd4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAD 10024 bytes