Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b63d778b39392af…

MALICIOUS

PDF

63.1 KB Created: 2020-08-23 15:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26fe5e00a572a977cc8e01606d2358a8 SHA-1: 048fd57250dba42a7b4c5d988bb09867061fa365 SHA-256: 8b63d778b39392af5975a7a4cbda31d96c73186e81e073cd5e39872824ee069a
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with 30 pointing to external PDF files hosted on cdn.shopify.com, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=bilibili+blue+apk', indicating a potential phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of links and the presence of a malicious redirector are strong indicators of 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=bilibili+blue+apk
    • http://fopiwo.globalpurposegroup.net/uploads/1/3/1/1/131164291/752611415c8b.pdf
    • http://files.brittanyrhager.com/uploads/1/3/1/4/131454024/3c4859331019.pdf
    • http://tunap.pdxmusicminister.com/uploads/1/3/1/8/131856772/0c4746e.pdf
    • https://cdn.shopify.com/s/files/1/0432/9137/7828/files/denusabupor.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/ischemic_stroke_definition.pdf
    • https://cdn.shopify.com/s/files/1/0435/4339/6506/files/dixalinalevulajavaf.pdf
    • https://cdn.shopify.com/s/files/1/0436/8669/0969/files/51592491166.pdf
    • https://cdn.shopify.com/s/files/1/0435/5178/5109/files/59661568194.pdf
    • https://cdn.shopify.com/s/files/1/0428/5631/7091/files/13410916251.pdf
    • https://cdn.shopify.com/s/files/1/0431/2940/5600/files/83946603454.pdf
    • https://cdn.shopify.com/s/files/1/0431/9074/7295/files/finezowekakade.pdf
    • https://cdn.shopify.com/s/files/1/0431/7600/1704/files/side_by_side_english_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46150969179.pdf
    • https://cdn.shopify.com/s/files/1/0430/9857/0909/files/accounting_ledger_software_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/8099/7269/files/34529249537.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006838.bin
60ea86e1be948df9d3754af89b18c6e70a627a0104b31e71338d89102f6cc704		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6838 15532 bytes
font_01_sfnt_off00009a18.bin
9802216f6de3914e4a8d8f6d5fa06b549bab25caebd0cb1cb45cf39aeb8b05fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A18 4792 bytes
font_02_sfnt_off0000aa74.bin
1622ca4c505c39227f7a95c6993d58293833d8d6594d95671062c4e7f3de9a0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA74 13856 bytes
font_03_sfnt_off0000d694.bin
15c1dba5fcb1cf46e5822d321c98407552b66fa43de2875a14985c3f85cfa2df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD694 16832 bytes

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