Malicious PDF — malware analysis report

Static analysis result for SHA-256 64451ff194db9e3d…

MALICIOUS

PDF

38.1 KB Created: 2020-08-23 05:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ac015d533342fa31f26a94878644c07 SHA-1: 273d213f51bb16d514f0c2b4db15090004e8300f SHA-256: 64451ff194db9e3d510bbee678cc8f3892221d1cd7f1d5b28fc87e87e52fd07b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the malicious URL and other Shopify-hosted PDF files, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to malicious infrastructure, likely for further exploitation or phishing.

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=remove+bixby+s9+android+pie
    • http://mojemu.albertoniego.com/uploads/1/3/0/8/130814310/85e8f87d8.pdf
    • http://files.upstagingdesign.com/uploads/1/3/1/3/131380295/7e27198c.pdf
    • http://files.churchesofchrist.com/uploads/1/3/0/7/130775978/38c0daf9e6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/6197/8023/files/penifodulipopofoki.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/gaxagewiror.pdf
    • https://cdn.shopify.com/s/files/1/0438/4971/1776/files/90595841523.pdf
    • https://cdn.shopify.com/s/files/1/0432/6499/9588/files/intro_to_psychology_kalat_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/5038/5051/files/xebek.pdf
    • https://cdn.shopify.com/s/files/1/0433/9879/1329/files/because_of_winn_dixie_worksheets_printable.pdf
    • https://cdn.shopify.com/s/files/1/0430/4034/2169/files/10844407526.pdf
    • https://cdn.shopify.com/s/files/1/0430/9028/0609/files/census_2020_form.pdf
    • https://cdn.shopify.com/s/files/1/0430/8942/8637/files/xasozejal.pdf
    • https://cdn.shopify.com/s/files/1/0435/3143/6186/files/ninoda.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/concone_lyrical_studies.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_off000057a5.bin
60fc40e0b0daa727601dd04f09b55d16b445a9a1f615b192dbcce3c65100b0ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x57A5 5604 bytes
font_01_sfnt_off00006aa2.bin
78edf9add01656b4d65aff519f1e7d004777a0993651991483fbb8c691129ce8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA2 9740 bytes