Malicious PDF — malware analysis report

Static analysis result for SHA-256 834a7eae876b07e8…

MALICIOUS

PDF

34.5 KB Created: 2020-08-02 17:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa4081938c8070b0a1b522f333afa5fc SHA-1: 864a2a8af72a8597752a1a9af157a2965dc926ea SHA-256: 834a7eae876b07e8c82600c1dd57b7251312fcddbf31471d57d0d3c7c660b313
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. The primary attack pattern involves redirecting users to external sites, likely for phishing or to download further malicious content.

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=d%2526+d+town+map+generator
    • http://files.rootsthatrundeep.net/uploads/1/3/1/4/131437532/a7cac8e45.pdf
    • http://files.exposingtheblackeconomyreport.com/uploads/1/3/0/7/130738614/1637513.pdf
    • http://files.ypoceanside.com/uploads/1/3/0/8/130814216/1100977.pdf
    • http://siroz.faith-without-walls.com/uploads/1/3/1/8/131872269/fimuvuwerokune_wuvigagim_dukaze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0010/3073/files/11504174686.pdf
    • https://cdn.shopify.com/s/files/1/0435/3176/3864/files/jetewevagusu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4343/8242/files/40108726985.pdf
    • https://cdn.shopify.com/s/files/1/0437/0199/3622/files/nowabifegepev.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/21977778440.pdf
    • https://cdn.shopify.com/s/files/1/0435/3989/0327/files/tapiseposezoxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3108/4708/files/menagofugemoratipupe.pdf
    • https://cdn.shopify.com/s/files/1/0432/6329/5654/files/28458733681.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7025/files/90626432231.pdf
    • https://cdn.shopify.com/s/files/1/0427/4988/6620/files/nugamejofenukexufozajeg.pdf
    • https://cdn.shopify.com/s/files/1/0436/1568/2717/files/bloodborne_executioner_gloves.pdf
    • https://cdn.shopify.com/s/files/1/0437/0831/7850/files/pevapoxeveteropowiwigi.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_off00004af5.bin
58eabb24298f18ab3cb5c3f3a5652a185830994b36fd37cd9ad46fcf77495092
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AF5 4156 bytes
font_01_sfnt_off00005924.bin
77cb4bce889afc5504295033602b57251e70884e3f2323a6082838a0a664f212
pdf-font-stream PDF embedded font (sfnt) at offset 0x5924 11076 bytes