Malicious PDF — malware analysis report

Static analysis result for SHA-256 65213d2a7def69f8…

MALICIOUS

PDF

45.5 KB Created: 2020-08-20 21:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 993e73a2ac944be2a32fb5563b4f9094 SHA-1: a99c567191eaa2ec1f7b69339dc69346ddfaadaf SHA-256: 65213d2a7def69f8afdabc253735e3567e5f68f7b4b448ac2162e3132d1f7eeb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged as malicious due to embedded links pointing to known malicious redirector infrastructure. It also contains a large number of external PDF links, many of which are hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The document body contains obfuscated text and a URL that appears to be the primary malicious redirector.

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=b+scan+ultrasound+pdf
    • http://files.geraldinepilgrim.com/uploads/1/3/2/8/132815346/6780435.pdf
    • http://wewuk.polizzigenealogy.com/uploads/1/3/2/6/132682137/giwobu.pdf
    • http://files.womensrightsnights.net/uploads/1/3/1/4/131452903/bipisamasaviwumo.pdf
    • http://files.liftingthecurtain.net/uploads/1/3/1/3/131383860/7000167.pdf
    • http://files.elshaddaiworldoutreach.org/uploads/1/3/1/8/131858287/rujobikisubuzedage.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/6988/8920/files/tiwirufabi.pdf
    • https://cdn.shopify.com/s/files/1/0427/4287/4278/files/88820553678.pdf
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/15158510231.pdf
    • https://cdn.shopify.com/s/files/1/0437/6654/6583/files/avengers_theme_piano_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/5271/8494/files/tusobamajedovosubobe.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9837/files/57538440395.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3862/files/46964164967.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/61926875792.pdf
    • https://cdn.shopify.com/s/files/1/0434/7792/6040/files/project_diva_pc_songs.pdf
    • https://cdn.shopify.com/s/files/1/0439/4018/4232/files/53504340072.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/business_plan_examples_in_kenya.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006811.bin
4f00c743622226216a21b660161086873fcd66dbf7ecda14ec699fde34102949		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6811 4912 bytes
font_01_sfnt_off000078c3.bin
5f035f3c1d66f04ebf0dc4e32ce447a6b84c69cffb7d4bff9dd12f9b083b4430		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78C3 10112 bytes
font_02_sfnt_off00009b53.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B53 4324 bytes

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