Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d6ebf7bb5149dda…

MALICIOUS

PDF

44.9 KB Created: 2020-08-22 04:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c3a5448db4e2ec80df78c2d22b75f4e SHA-1: e7c277a44c79c80a9ce0cdfa5bb4ec1bd32f33ca SHA-256: 5d6ebf7bb5149dda81ee9489bb456d6fc5f0648f2d5136156775818a4a9a1992
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic designed to lead users to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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=patogenesis+keratosis+seboroik+pdf
    • http://files.energizeri.org/uploads/1/3/0/7/130775753/9636668.pdf
    • http://wemito.custombarrelworks.com/uploads/1/3/0/7/130739695/sureka.pdf
    • http://files.deiduemondi.com/uploads/1/3/2/6/132682204/fazasebusav-dipozosegil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6718/7108/files/tmux_open_session.pdf
    • https://cdn.shopify.com/s/files/1/0435/4008/6935/files/hymns_made_easy.pdf
    • https://cdn.shopify.com/s/files/1/0432/4337/2703/files/nitrogenous_fertilizers.pdf
    • https://cdn.shopify.com/s/files/1/0428/3678/7356/files/tijekolef.pdf
    • https://cdn.shopify.com/s/files/1/0430/9617/8845/files/16821349941.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/98952619126.pdf
    • https://cdn.shopify.com/s/files/1/0436/8780/5081/files/adjustment_letter_examples.pdf
    • https://cdn.shopify.com/s/files/1/0437/3685/8776/files/gixinopomoxomafun.pdf
    • https://cdn.shopify.com/s/files/1/0464/7560/8214/files/zanewereburuda.pdf
    • https://cdn.shopify.com/s/files/1/0431/0722/1658/files/mexufudamabezalibido.pdf
    • https://cdn.shopify.com/s/files/1/0440/5297/1685/files/vipiwuv.pdf
    • https://cdn.shopify.com/s/files/1/0436/3337/7440/files/new_south_movie_in_hd.pdf
    • https://cdn.shopify.com/s/files/1/0438/9083/5624/files/diguzidezetaxumikuvulod.pdf
    • https://cdn.shopify.com/s/files/1/0466/3443/4725/files/78686729417.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_off000070d5.bin
e0b2fae8529cfb17958793bd563f065d01cd617f865c4f23d7749f98d2210d64
pdf-font-stream PDF embedded font (sfnt) at offset 0x70D5 5380 bytes
font_01_sfnt_off00008327.bin
bd5edcf15f15e7ba5e3a4d1ef957436b8fae3530d2faec2393b3af5f7b8b36b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8327 10432 bytes