Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c538ecf3a50d39…

MALICIOUS

PDF

46.8 KB Created: 2020-08-01 18:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f1cf4c828cedd935826b16f81ab6257 SHA-1: 1fc3e00b1a11e16c73763154f4d797b4130aab96 SHA-256: 77c538ecf3a50d39971b74581837caf561478772ed0515c46102ba29b5cf1c85
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, also contains the same malicious URL. This suggests a phishing or scam attempt designed to lure users to malicious sites.

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=dogpile+search+engine
    • http://files.ksharp1.com/uploads/1/3/1/4/131407439/joxarezepowa.pdf
    • http://files.homescapejournal.com/uploads/1/3/1/4/131454024/3539948.pdf
    • http://files.drheatherloenser.com/uploads/1/3/0/8/130874201/74f6d019228d0ab.pdf
    • http://files.photosbysarahtucker.com/uploads/1/3/0/7/130775174/fekokirubuxugor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/podufa.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2277/files/45605830219.pdf
    • https://cdn.shopify.com/s/files/1/0430/6688/4250/files/10508173004.pdf
    • https://cdn.shopify.com/s/files/1/0431/2023/0564/files/66233977731.pdf
    • https://cdn.shopify.com/s/files/1/0431/2340/9057/files/bumomovegiduv.pdf
    • https://cdn.shopify.com/s/files/1/0441/0490/8952/files/8634094544.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/3441145176.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7870/files/82016255276.pdf
    • https://cdn.shopify.com/s/files/1/0440/2610/1910/files/71902462932.pdf
    • https://cdn.shopify.com/s/files/1/0437/4387/1127/files/lerogaxidet.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_off0000787b.bin
7d9264bbd323fce3fbc4f10ae54046545127213923ae4dbd2bd798de1a20437e
pdf-font-stream PDF embedded font (sfnt) at offset 0x787B 5196 bytes
font_01_sfnt_off00008a28.bin
b6f4d72915211fcffb1b7337e7581d07a0d584c6bd0499e9b605b30a5ed4a063
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A28 10504 bytes