Malicious PDF — malware analysis report

Static analysis result for SHA-256 52102000301a0b73…

MALICIOUS

PDF

54.0 KB Created: 2020-08-02 07:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d7bc215a4904e29200a3c1da16f33cf SHA-1: e44ffc5b28dad14d621ece9b1289bd64a9b3b617 SHA-256: 52102000301a0b73f56bd6803e66d2bad4ffd10d3008c83df207648a8004ee59
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=mcculloch+chainsaw+manual'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to download further content or redirect to a malicious site.

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=mcculloch+chainsaw+manual
    • http://files.lanzaroteboathotel.com/uploads/1/3/1/4/131437699/tinak.pdf
    • http://files.bradschmidtdesigns.com/uploads/1/3/1/8/131857041/zevamimode.pdf
    • http://files.renewableblooms.com/uploads/1/3/0/7/130740596/gijomezalakex-jifuridulexol-zeweledo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9063/2101/files/43303172368.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9807/files/gexurirepegejokawodawamo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/26369978761.pdf
    • https://cdn.shopify.com/s/files/1/0429/0369/9615/files/pokepolubi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6943/2230/files/kezexonumatemob.pdf
    • https://cdn.shopify.com/s/files/1/0435/5234/2184/files/83721515372.pdf
    • https://cdn.shopify.com/s/files/1/0435/4372/4186/files/rebebavipebipebamozib.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/vuvijojavazumulatenifot.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5237/files/foropesizigibo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1977/1799/files/76942121203.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35035436777.pdf
    • https://cdn.shopify.com/s/files/1/0432/9183/6572/files/18765889297.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_off00009683.bin
886f6ea5637c35ff898465c4db8e848a051bf47ae2090cac1ca7a79d6800c35e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9683 5040 bytes
font_01_sfnt_off0000a79e.bin
7a8fa75154c68a19ae556328dda1edbd6d041dd3ea775ee4a02e89573971a871
pdf-font-stream PDF embedded font (sfnt) at offset 0xA79E 10328 bytes