Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79a264c295a55bd…

MALICIOUS

PDF

43.6 KB Created: 2020-08-24 11:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfd4ac7db199b86b57a0c02263071512 SHA-1: 9240b8df34811b00eec5c18d7adc15f2e2b0f9a0 SHA-256: a79a264c295a55bdb1e5f3ed02e5e1838875a49d6a517a494394014d01184e60
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with a critical heuristic firing indicating a PDF link farm. One of these links, 'https://ttraff.cc/pify?keyword=wow+classic+alchemy+leveling+guide+alliance', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to lure users to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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=wow+classic+alchemy+leveling+guide+alliance
    • http://files.gncpw.com/uploads/1/3/0/8/130874361/jepogigirevurixanepa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9948/8410/files/62603003545.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/3060794579.pdf
    • https://cdn.shopify.com/s/files/1/0448/4349/9677/files/auckland_downtown_map.pdf
    • https://cdn.shopify.com/s/files/1/0428/7922/1919/files/john_sarno_mindbody_prescription.pdf
    • https://cdn.shopify.com/s/files/1/0435/3540/1109/files/bioenergetics_nicholls_ferguson.pdf
    • https://cdn.shopify.com/s/files/1/0431/5696/3479/files/94808413821.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/kumejilewide.pdf
    • https://cdn.shopify.com/s/files/1/0429/6510/6847/files/93712909028.pdf
    • https://cdn.shopify.com/s/files/1/0429/7703/4399/files/61779146532.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f27.bin
630a2b269dc2a522ae59dff2da672dc14f227f20216e57aa37b84c0fd6e27062
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F27 5324 bytes
font_01_sfnt_off00007130.bin
ce47799bc6c0a84c94574cb374eda9cd179dbc54b6ea63ff98a793bac651e601
pdf-font-stream PDF embedded font (sfnt) at offset 0x7130 10164 bytes
font_02_sfnt_off000093e5.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x93E5 4324 bytes