Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc28f810e5a5295b…

MALICIOUS

PDF

42.6 KB Created: 2020-08-22 09:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbc03221668187970dd8c34df3bbb457 SHA-1: 7ded14cc86a590229973be018e92a3418eaf1413 SHA-256: bc28f810e5a5295b8646e5944fb87359ccd54a634ee0a276c463d39d213f898d
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. This URL is used in a lure to download games, suggesting a phishing or malware distribution attempt. The document also exhibits characteristics of a PDF link farm, with numerous links to external PDFs, many hosted on Shopify. The ML classifier strongly supports the malicious verdict.

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=baixar+jogos+para+pc++utorrent
    • http://files.bigdaybyabbey.com/uploads/1/3/1/4/131437139/aedd5.pdf
    • http://files.scenerychanges.com/uploads/1/3/0/9/130969525/juxapimirure-nidina-sabatip-zopin.pdf
    • http://pumago.hrv4biofeedback.com/uploads/1/3/1/8/131857114/9669032.pdf
    • https://cdn.shopify.com/s/files/1/0432/1030/9787/files/app_blablacar_android.pdf
    • https://cdn.shopify.com/s/files/1/0427/6345/2583/files/sagilaxurizuwupasevazixuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0512/files/78483694164.pdf
    • https://cdn.shopify.com/s/files/1/0435/2681/5895/files/30755896672.pdf
    • https://cdn.shopify.com/s/files/1/0431/9910/3136/files/47668188930.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/tapumunesaxezakejib.pdf
    • https://cdn.shopify.com/s/files/1/0431/5801/2068/files/45235959853.pdf
    • https://cdn.shopify.com/s/files/1/0432/6385/2712/files/19992262906.pdf
    • https://cdn.shopify.com/s/files/1/0433/7162/6659/files/5841071187.pdf
    • https://cdn.shopify.com/s/files/1/0430/4093/1991/files/tasugojum.pdf
    • https://cdn.shopify.com/s/files/1/0437/1188/9562/files/bugazarawab.pdf
    • https://cdn.shopify.com/s/files/1/0436/1987/7026/files/wejes.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_off00006284.bin
1f02837f6310c53809424afdec37fcac81d2d11d2ee0642a348ddd2932db88dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6284 5264 bytes
font_01_sfnt_off00007482.bin
48d4b596ddc5e438ac3b73cb800538ed241a0e206407704efb68c8ec24704cb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7482 13120 bytes