Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15c80252b37c333…

MALICIOUS

PDF

62.2 KB Created: 2020-08-13 22:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 269c4418d04d6fbaa500800e97e5c726 SHA-1: b018a74721a46fbda2bb2184514214807155cff6 SHA-256: a15c80252b37c333cf9e7e8a4e6f7311660b4820550a2da0a91d199bfb3c7de3
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=birthday+song+status++mp4'. Additionally, it features a PDF link farm with numerous links, including one to 'https://cdn.shopify.com/s/files/1/0433/3872/7589/files/samimixakerupifuwol.pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirect URL, reinforcing the malicious intent.

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=birthday+song+status++mp4
    • http://vodetab.westsydneyparanormal.org/uploads/1/3/0/8/130874233/xubugesilugiru.pdf
    • http://files.yachtavailability.com/uploads/1/3/0/8/130813887/215f5c.pdf
    • http://files.fyldecoastplayers.com/uploads/1/3/1/0/131070192/7438423.pdf
    • http://files.destinationhbcu.org/uploads/1/3/1/3/131378950/0731bdc434c9.pdf
    • https://cdn.shopify.com/s/files/1/0433/3872/7589/files/samimixakerupifuwol.pdf
    • https://cdn.shopify.com/s/files/1/0433/4904/9499/files/dell_dim_2350.pdf
    • https://cdn.shopify.com/s/files/1/0438/8998/3640/files/xurevuropobig.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0413/files/99538076065.pdf
    • https://cdn.shopify.com/s/files/1/0434/0944/0924/files/abakada_alphabet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25424470269.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3912/files/fapijegom.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/restricted_holidays_2020_tamil_nadu_state_government.pdf
    • https://cdn.shopify.com/s/files/1/0437/3767/7989/files/55213652960.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/ruxekoluwasujiwelerise.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_off00008fa8.bin
9f54d767d57effb2dcbbc49da633079688f45676a467c634cf902e286f9a85d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA8 5580 bytes
font_01_sfnt_off0000a291.bin
cc786797e3c8fa65cfa642d1d292b2932298bba1b2083ac7132731576bdfb23d
pdf-font-stream PDF embedded font (sfnt) at offset 0xA291 13336 bytes
font_02_sfnt_off0000cc1e.bin
1df41416ece054d3cca32f135e48dc95f4d9c8a2bff4ba4edba1d14e21aabef6
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1E 18776 bytes