Malicious PDF — malware analysis report

Static analysis result for SHA-256 04ab5a500f1967e9…

MALICIOUS

PDF

37.8 KB Created: 2020-08-05 23:39:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92ded100baa1f4ef9f6e90e9f4b3e76f SHA-1: 0a3271dbb6ee8dd7487b3131617de68982c52b37 SHA-256: 04ab5a500f1967e9a6461d2b0ec2cad8d38350cb43e046a8f70b33ef15fca56c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. It also features a large number of external PDF links, suggesting a link farm for SEO manipulation or to distribute malicious content. The ML classifier strongly indicates maliciousness, and the embedded URLs point to potentially harmful infrastructure.

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=skf+ball+bearing+size+catalogue+pdf
    • http://files.rozanalee.com/uploads/1/3/1/3/131380729/2604032.pdf
    • http://files.chocolateexpressonline.com/uploads/1/3/1/1/131164009/1534059.pdf
    • http://files.willowcourtstables.com/uploads/1/3/0/7/130739419/peworo_sosikidak_zofopupuk.pdf
    • http://files.airbrushinggourds.com/uploads/1/3/2/7/132712306/4199266.pdf
    • http://files.yogawithieva.com/uploads/1/3/1/4/131438071/batedul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/1355/1781/files/79784289311.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mikawewetekiwu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8987/0491/files/kagotutiv.pdf
    • https://cdn.shopify.com/s/files/1/0439/3431/8760/files/kufegelunifinamujimur.pdf
    • https://cdn.shopify.com/s/files/1/0436/9671/7977/files/zegoribazaweraganonu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/14399328137.pdf
    • https://cdn.shopify.com/s/files/1/0438/0003/5485/files/fazemawoma.pdf
    • https://cdn.shopify.com/s/files/1/0432/2616/9503/files/how_to_declare_an_arraylist.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3678/files/81579640873.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_off000056f4.bin
13e47ad7be0f44a5a6c0b4d42288a07af957d6fae1456161b2dce679f80e7f12
pdf-font-stream PDF embedded font (sfnt) at offset 0x56F4 5680 bytes
font_01_sfnt_off00006a64.bin
63de808aaf1a49e523e5e9be5eaa21a8b87c5178e285d92ee2a0d5425a5e2291
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A64 9428 bytes