Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f0010b793a033d…

MALICIOUS

PDF

56.3 KB Created: 2020-08-20 14:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08aeb85aa5b254b6519dde70745d36eb SHA-1: c20fff29db1ebf8b8ad481a2954f8fc4a35bfbc2 SHA-256: b5f0010b793a033d0220bca375d7691cb24b06d53504f18d41f94477db3acf2c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/pify?keyword=anarkali+old+songs+free'. Additionally, it exhibits a PDF link farm heuristic, with many links pointing to Shopify domains, suggesting an attempt to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL.

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=anarkali+old+songs+free
    • http://files.kofcemporia.org/uploads/1/3/1/6/131636692/6b65c3.pdf
    • https://cdn.shopify.com/s/files/1/0434/0780/2518/files/ritojafukajopazokifad.pdf
    • https://cdn.shopify.com/s/files/1/0438/3227/9190/files/zomer.pdf
    • https://cdn.shopify.com/s/files/1/0437/1513/3605/files/98171789777.pdf
    • https://cdn.shopify.com/s/files/1/0435/5247/3243/files/widut.pdf
    • https://cdn.shopify.com/s/files/1/0433/0287/9387/files/java_iterate_through_hashmap.pdf
    • https://cdn.shopify.com/s/files/1/0438/0724/4450/files/pudafifupikedupi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9323/7665/files/9618182465.pdf
    • https://cdn.shopify.com/s/files/1/0435/4175/8101/files/pakufijizokofewagaguz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/64x64_picture_png.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66179678401.pdf
    • https://cdn.shopify.com/s/files/1/0429/7487/1711/files/molofatarerukusuvez.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/ramizigafuvoladug.pdf
    • https://cdn.shopify.com/s/files/1/0438/6488/3355/files/mugum.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009367.bin
4262268492c3825245c2110e5da2adef2b28552a03e9afc897887ee198d5143f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9367 5128 bytes
font_01_sfnt_off0000a4df.bin
e51234cfee930e14fdb993dea89390216081e6884c2e92a1ca3a4453da97b49e
pdf-font-stream PDF embedded font (sfnt) at offset 0xA4DF 14820 bytes