Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28922fc2109a056…

MALICIOUS

PDF

42.7 KB Created: 2020-08-17 14:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e22305a48ae8aef0d8e4f2ef757c1a96 SHA-1: 1ae86c6360f81f817236e090d8fe70e0649acf55 SHA-256: b28922fc2109a056761fa8df9dee1fddd1bdb2721049aa5c8771af0664e8a2ee
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, masquerading as a "complete guitar guide pdf". One of these links, https://ttraff.cc/pify?keyword=complete+guitar+guide+pdf, is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The presence of a malicious redirector suggests the document is designed to lead users to harmful content or further stages of an attack.

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.cc/pify?keyword=complete+guitar+guide+pdf
    • http://batozela.216optimist.com/uploads/1/3/0/8/130814706/cfba6cdcc10e57.pdf
    • http://dumolob.zandertherapeutics.com/uploads/1/3/1/6/131637136/viwop-tamonuxupeme.pdf
    • http://files.12chemistry.com/uploads/1/3/0/7/130739143/novutejizikojekuv.pdf
    • http://files.crystalsandcreme.com/uploads/1/3/1/4/131453595/5496599.pdf
    • http://voxotak.twhstheater.com/uploads/1/3/0/7/130739616/japupor-zekatux-bavodabi-vibalizabaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/7227/5103/files/vovavajaxeduwalito.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2337/files/74325534036.pdf
    • https://cdn.shopify.com/s/files/1/0440/1309/3029/files/likeravasejo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4224/2709/files/54297375213.pdf
    • https://cdn.shopify.com/s/files/1/0434/4584/6168/files/11916237226.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6119/files/77230388206.pdf
    • https://cdn.shopify.com/s/files/1/0429/5871/7087/files/biology_class_11_notes_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/2670/8640/files/hunger_games_vk.pdf
    • https://cdn.shopify.com/s/files/1/0447/1816/2074/files/photosynthesis_and_cellular_respiration_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/47475039241.pdf
    • https://cdn.shopify.com/s/files/1/0431/6413/9674/files/sigle_cartoni_animati_anni_80.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_off000069e1.bin
173bb663c70aeab205b2af5f07410e714a9c0906e429b28e1535c9431ab2f0fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E1 5088 bytes
font_01_sfnt_off00007b1b.bin
ef4dcb20445bb4607f5aa9720764ba4f27a936fb70079d4b6f68f3a83f7928c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B1B 10148 bytes

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