Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f2db7b22cbbc76…

MALICIOUS

PDF

137.5 KB Created: 2020-08-07 08:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b6feac06062102a27d02b97c764f6ae SHA-1: 42d0166b449ab5609b44b8671eb0f35d3ed4db8d SHA-256: 50f2db7b22cbbc76434f27a8636f3245519b497066f4e972ae17c9a0c50e0796
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 'ttraff.cc'. The document body, though heavily obfuscated, contains a URL that appears to be the same as the malicious redirector. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=matura+rozszerzona+angielski+s%25C5%2582ownictwo+pdf
    • http://ridiwikut.duneridersponyclub.org/uploads/1/3/0/7/130776791/nimaxixejoga-bomazegojen-jerexof.pdf
    • http://files.michaelmaguire.com.au/uploads/1/3/0/8/130874612/naxugigiputu-xunujefoxujuka-zetepat.pdf
    • http://files.daytonaramblings.com/uploads/1/3/1/4/131414240/387650.pdf
    • http://zutekukuv.scotholme.com/uploads/1/3/1/6/131637881/xisufulidapobev.pdf
    • http://files.thelopezlibrary.com/uploads/1/3/1/3/131383613/metelazutajaduki.pdf
    • https://cdn.shopify.com/s/files/1/0430/0413/3525/files/xirawedupekizodij.pdf
    • https://cdn.shopify.com/s/files/1/0437/2869/9553/files/anexo_2_simples_nacional_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/7651/8049/files/53883968186.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/jejononufite.pdf
    • https://cdn.shopify.com/s/files/1/0433/7162/6652/files/86152992125.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1013/files/rozesavamewabazi.pdf
    • https://cdn.shopify.com/s/files/1/0437/1097/2053/files/10429708434.pdf
    • https://cdn.shopify.com/s/files/1/0440/5598/6341/files/8248606381.pdf
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/gamma_world_4th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/4101/3415/files/jenisilopalax.pdf
    • https://cdn.shopify.com/s/files/1/0443/8884/3686/files/cayaponia_tayuya.pdf
    • https://cdn.shopify.com/s/files/1/0433/8201/4108/files/70389914766.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_off0001ccad.bin
678d08f1c0b4cb09cb3926d7db8e485472b33f0cd112d9d542616dddb65a1dc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCAD 5472 bytes
font_01_sfnt_off0001df84.bin
97a10346f64dc8df893cfad7293e297e172ade5fd35fa3079b2d1c1300601781		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF84 12940 bytes
font_02_sfnt_off00020786.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20786 4324 bytes

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