Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa790f56d14f2bf…

MALICIOUS

PDF

52.7 KB Created: 2020-08-21 11:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f5caa70538f9d775c97a50676066997 SHA-1: d0b9a335654824ad7a1f17df7c592f7889878d04 SHA-256: 0fa790f56d14f2bfcb2b88c8ae8688d78f50a2e743ee3a33b3dc405b97dea632
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, forming a link farm, with at least one link directing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of a malicious redirector suggests an attempt to lure users to malicious content, likely for phishing or malware distribution.

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=binks+sake+brook
    • http://files.namiwashcounty.org/uploads/1/3/1/1/131164310/1c743995a0d6bd7.pdf
    • http://files.hsiaoaiwang.com/uploads/1/3/2/6/132682615/7248143.pdf
    • http://files.pickleball-germany.net/uploads/1/3/0/7/130775634/boxopamokufafame.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/5538/0630/files/57856925774.pdf
    • https://cdn.shopify.com/s/files/1/0437/7001/9998/files/linux_screen_command.pdf
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/56329429182.pdf
    • https://cdn.shopify.com/s/files/1/0427/7341/4055/files/tizadinakisekuxafisipodak.pdf
    • https://cdn.shopify.com/s/files/1/0430/7301/1865/files/libro_los_cazadores_de_microbios.pdf
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/56062088829.pdf
    • https://cdn.shopify.com/s/files/1/0429/0406/0071/files/benim_hocam_tyt_tarih_video_ders_notlar.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/94064070281.pdf
    • https://cdn.shopify.com/s/files/1/0450/1949/6606/files/splatoon_2_lobby.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f90.bin
71e19904f78ec8175dbd4f594d250a4763db438f994122da1a6cac5fcf5281ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F90 15740 bytes
font_01_sfnt_off0000929e.bin
72eadeaa145a305c2566d857760f29f1441b7c25a6e8177aa750bfb9fd7c1b5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x929E 4900 bytes
font_02_sfnt_off0000a34e.bin
013291c7d262aa2ff623857c67f7f072105ecbebb1e477cef8e5425f059fc387
pdf-font-stream PDF embedded font (sfnt) at offset 0xA34E 10156 bytes