Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b4e1f2a01490e6…

MALICIOUS

PDF

40.9 KB Created: 2020-08-18 22:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb2640d1059eeabdfbe5632d28be8c94 SHA-1: 85b3bab8a25951f41511172894f955bc751762d5 SHA-256: f2b4e1f2a01490e6c93a8d12f5aabb5774fd24d768b62a4599439431d0347529
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, characteristic of a link farm. One of these links, https://ttraff.ru/pify?keyword=yarrawonga+14+day+weather+report, is identified as a malicious redirector. This suggests the document is designed to lure users into clicking malicious links, potentially for phishing or malware distribution. The ML classifier strongly supports the malicious verdict.

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=yarrawonga+14+day+weather+report
    • http://files.democraticclubofthewoodlands.com/uploads/1/3/1/4/131406751/21727ac.pdf
    • http://files.palos-verdes-gem-and-mineral-society.org/uploads/1/3/1/1/131163667/gulak-lozejepa-jidorumexe-texuvafexepab.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/zefizazutisuruxobu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5253/1869/files/bifebanukewakolulojo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/zabavu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8548/7516/files/suzuki_df6_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mofofuledezenededur.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2441/files/puzolibuxezosaxisikum.pdf
    • https://cdn.shopify.com/s/files/1/0429/1028/5990/files/22954686576.pdf
    • https://cdn.shopify.com/s/files/1/0429/5373/6348/files/statuto_assemblee_di_dio_in_italia.pdf
    • https://cdn.shopify.com/s/files/1/0445/9580/6372/files/genetics_biology.pdf
    • https://cdn.shopify.com/s/files/1/0429/6710/5687/files/91914297301.pdf
    • https://cdn.shopify.com/s/files/1/0433/9338/4599/files/80706935399.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66048758492.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_off00005ac2.bin
9f748db39cf0d8df938ffe35d5147c0196d76a2cb3aaf1d70d2c8ceef1bf40c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC2 5308 bytes
font_01_sfnt_off00006ce7.bin
e89c180660afcc8f59181f452cb024b73d48b9decd45220aa8bd7673bb4dc29c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE7 13352 bytes