Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf99606fa8037e1…

MALICIOUS

PDF

43.7 KB Created: 2020-08-22 13:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d2a20e8f112db1fcde99011475793a9 SHA-1: bcd54286f299d72e3563136fe992de5601bf9a1b SHA-256: 5bf99606fa8037e1bf5d9171d02ad6699ba83ddc6fd35ed54a248da6edcab51f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=bulbul+song++asomi'. The document body, though heavily obfuscated, contains this URL and numerous other PDF links, suggesting a link farm or redirection tactic. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and the redirector link indicate an attempt to lead the user to malicious content, likely a phishing or malware distribution site.

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=bulbul+song++asomi
    • http://dumopeku.dietrichleisimages.com/uploads/1/3/1/6/131606490/712069.pdf
    • http://lorot.eastmainstdesign.com/uploads/1/3/0/7/130775432/75074c2.pdf
    • http://files.jackieleishman.com/uploads/1/3/1/3/131383325/tasesu.pdf
    • http://kavavul.eatatcrisp.com/uploads/1/3/0/7/130776791/861929.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5326/0701/files/856247954.pdf
    • https://cdn.shopify.com/s/files/1/0434/0298/5622/files/namozo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5355/5610/files/crioterapia_dermatologia.pdf
    • https://cdn.shopify.com/s/files/1/0434/0930/9848/files/jufezid.pdf
    • https://cdn.shopify.com/s/files/1/0438/5056/3734/files/47868043876.pdf
    • https://cdn.shopify.com/s/files/1/0432/5251/4979/files/salinivedijimumalepinegit.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6651/files/tofixaleduropopiminelixu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1109/6221/files/25814409499.pdf
    • https://cdn.shopify.com/s/files/1/0449/2935/1835/files/behavioural_counselling_approach.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_off000061d0.bin
2b9d7d5d02515259b92325f38b3dadefef16f4169f8042c4d2f56632aacd7519
pdf-font-stream PDF embedded font (sfnt) at offset 0x61D0 5100 bytes
font_01_sfnt_off00007315.bin
10aec50f789deee9f79c9dfc78ea4da23558abeedbb05fe9d90e892362875313
pdf-font-stream PDF embedded font (sfnt) at offset 0x7315 14776 bytes