Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a76596bdc651ece…

MALICIOUS

PDF

49.7 KB Created: 2020-08-06 01:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd4a84f1330469ef89bef353096a02bb SHA-1: 4b4bb1baa58a926474f83d86791ff11185d0f5cf SHA-256: 8a76596bdc651ecefaaf20543b208d096d23d3647f33015aa6c7320827abab7d
152 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 'https://ttraff.cc/pify?keyword=official+rules+of+card+games+pdf'. This indicates the document's primary purpose is to redirect users to potentially harmful content. Additionally, the PDF includes a mass external link farm, with many links pointing to Shopify domains, suggesting an attempt to obscure the malicious redirector or leverage legitimate platforms for distribution. The ML classifier also strongly flagged this PDF as malicious.

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=official+rules+of+card+games+pdf
    • http://files.harvestpfc.com/uploads/1/3/1/0/131070161/2689152.pdf
    • http://ruwifasu.sorellaatahvictoriana.com/uploads/1/3/2/7/132712615/853849.pdf
    • http://files.toricoryphotography.com/uploads/1/3/1/4/131438405/zasagod-lekakume-jetisenaton.pdf
    • http://files.decision-camp.com/uploads/1/3/2/3/132302871/240b80a.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96328102714.pdf
    • https://cdn.shopify.com/s/files/1/0428/4442/2310/files/rolibibedifexojomulokima.pdf
    • https://cdn.shopify.com/s/files/1/0430/0832/7829/files/xomovusuramu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6578/6006/files/45425677753.pdf
    • https://cdn.shopify.com/s/files/1/0438/4541/9173/files/86920993345.pdf
    • https://cdn.shopify.com/s/files/1/0433/7254/4150/files/sq9_mini_dv_camera_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/4597/6224/files/jomerid.pdf
    • https://cdn.shopify.com/s/files/1/0429/1444/7519/files/jurnal_lp_bblr.pdf
    • https://cdn.shopify.com/s/files/1/0435/0800/7064/files/peltier_ac.pdf
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/31220437100.pdf
    • https://cdn.shopify.com/s/files/1/0427/8353/9366/files/rawiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/gepidagex.pdf
    • https://cdn.shopify.com/s/files/1/0437/8502/7746/files/36349662169.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_off000082be.bin
f2292470c5a8d448462f0def62eb2ffa05e4d49905f8badfa95a49fc245dc6bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82BE 5504 bytes
font_01_sfnt_off00009560.bin
24f28766cce43e2d618c8263501e6ca77801dc8907abb0516492bcd8d55b3c2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9560 10756 bytes

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