Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af680022b3e5f30…

MALICIOUS

PDF

58.8 KB Created: 2020-08-06 07:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8276e30c5e744d52c4728672773a51d SHA-1: c0f3c0d94d46602153a5a15a3ca70b99d687f162 SHA-256: 2af680022b3e5f3065de1cbe3870fcae9003f897572d99f50beb3985413b70bb
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.ru/pify?keyword=behaviorismo+metodol%25C3%25B3gico+e+radical+pdf, is identified as a malicious redirector. This suggests the document's primary purpose is to lure users into clicking malicious links, likely leading to further stages of an attack. The ML classifier strongly supports the malicious nature of this PDF.

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=behaviorismo+metodol%25C3%25B3gico+e+radical+pdf
    • http://files.salsaritaslexky.com/uploads/1/3/0/7/130740323/0b69b82.pdf
    • http://mufafinow.orionhat.com/uploads/1/3/1/6/131606027/988081.pdf
    • http://files.sgesurfreport.com/uploads/1/3/0/9/130969657/mizetodisefeju.pdf
    • http://nefigon.lqqkerinsider.com/uploads/1/3/0/7/130740044/juturizexiluto.pdf
    • http://files.southsurreygardenclub.ca/uploads/1/3/1/3/131398019/tefowipuxuj.pdf
    • https://cdn.shopify.com/s/files/1/0438/2051/5488/files/68305319996.pdf
    • https://cdn.shopify.com/s/files/1/0438/1619/0112/files/discord_bold_text.pdf
    • https://cdn.shopify.com/s/files/1/0429/7054/6329/files/47642485911.pdf
    • https://cdn.shopify.com/s/files/1/0432/1571/6513/files/fadinujosoviziwato.pdf
    • https://cdn.shopify.com/s/files/1/0433/4351/1702/files/28217606220.pdf
    • https://cdn.shopify.com/s/files/1/0433/3862/9275/files/9687465686.pdf
    • https://cdn.shopify.com/s/files/1/0434/7035/6637/files/gizisarogaxejaji.pdf
    • https://cdn.shopify.com/s/files/1/0434/8405/3669/files/49147956619.pdf
    • https://cdn.shopify.com/s/files/1/0433/8361/9736/files/93881848815.pdf
    • https://cdn.shopify.com/s/files/1/0431/3474/6781/files/video_game_notification_sounds.pdf
    • https://cdn.shopify.com/s/files/1/0436/2053/2384/files/53438940041.pdf
    • https://cdn.shopify.com/s/files/1/0435/2881/4741/files/53231219653.pdf
    • https://cdn.shopify.com/s/files/1/0429/0091/4343/files/62188925169.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_off000097a9.bin
1d1b95930930cc67222c3d98146d594613ceb5e4fc8777057b6bad9df73f0022		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97A9 5496 bytes
font_01_sfnt_off0000aa2c.bin
6858cd6da0710d06c6bcc5a5b30f67d4d816060854c42ec2924e09836e116294		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA2C 10500 bytes
font_02_sfnt_off0000cd85.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD85 4324 bytes

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