Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d004667bb8fbf9…

MALICIOUS

PDF

54.7 KB Created: 2020-07-30 15:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c971b2db025c98f577dd76307949077 SHA-1: 33052bc100f80710244e85831b514916ec1f0d23 SHA-256: 78d004667bb8fbf9985052572d4f4555a2f7e915e5bc6cd32f631e08e1bb0a68
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector at 'ttraff.ru', disguised as a free download. This suggests a phishing or SEO poisoning attack aimed at redirecting users to malicious content. The ML classifier also strongly indicated maliciousness.

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=amaravati+kathalu+pdf+file+free+download
    • http://files.midpacificowlrobotics.com/uploads/1/3/1/4/131483031/5ce249d84d51.pdf
    • http://files.mrshowesclass.com/uploads/1/3/2/7/132740502/nutelokujafoxo-vufugawon.pdf
    • http://files.christianlarsonbball.com/uploads/1/3/1/4/131406977/a1bb9e2.pdf
    • http://files.kippcourage.com/uploads/1/3/2/8/132814305/pizubarij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sogogetuxupoxex.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/50971407729.pdf
    • https://cdn.shopify.com/s/files/1/0429/3882/6918/files/goxewowiker.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lugapib.pdf
    • https://cdn.shopify.com/s/files/1/0434/1481/4885/files/kujawil.pdf
    • https://cdn.shopify.com/s/files/1/0431/6305/8333/files/rotexul.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8073/files/mofoxivokidis.pdf
    • https://cdn.shopify.com/s/files/1/0432/9468/7400/files/16228319131.pdf
    • https://cdn.shopify.com/s/files/1/0436/6876/6873/files/20691581993.pdf
    • https://cdn.shopify.com/s/files/1/0429/8850/3203/files/39976754743.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_off00006a3e.bin
b6ca22275526976adbbe336f2f1c3dbe49b1e9f38cafee54e8fe5c4d9bf50199
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A3E 5192 bytes
font_01_sfnt_off00007bcc.bin
f85d78ffebd9d6fddb625d403f6ff94782bb80f8386e2404e6919548fd3be734
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BCC 19560 bytes
font_02_sfnt_off0000aa43.bin
4dd19d8e9fd2734f4d1350e671181f018a1e600c0c7a2556a05d8a300b7bf61e
pdf-font-stream PDF embedded font (sfnt) at offset 0xAA43 10256 bytes