Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a33325d9935f89f…

MALICIOUS

PDF

59.5 KB Created: 2020-08-06 16:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3cb8816de5bb40a71558ecaa450318a SHA-1: af2b20bc879309aad480d02eb71c25560584477a SHA-256: 1a33325d9935f89f031bdc16eac759ed9f2d6fcff4b6f7ffc14761e3abdf429f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'statistical process control reference manual pdf', likely a lure. The presence of many Shopify links suggests a link farm or SEO poisoning tactic to distribute the malicious PDF. The ML classifier strongly indicates maliciousness.

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.com/pify?keyword=statistical+process+control+reference+manual+pdf
    • http://files.diabetesuniversitydmcp.com/uploads/1/3/2/8/132815791/5277034.pdf
    • http://files.gannonjwattscounseling.com/uploads/1/3/2/6/132682022/7f8b22ff5febf43.pdf
    • http://files.paulasherbals.com/uploads/1/3/0/7/130776519/38c697365a5d2f.pdf
    • http://files.amicilyricopera.com/uploads/1/3/1/4/131453031/f4efb3c.pdf
    • http://files.sextherapyportland.com/uploads/1/3/1/6/131606280/cfec3.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gizuvesadumewagetikuxumut.pdf
    • https://cdn.shopify.com/s/files/1/0433/1667/4713/files/65804066205.pdf
    • https://cdn.shopify.com/s/files/1/0430/3935/9127/files/xizig.pdf
    • https://cdn.shopify.com/s/files/1/0429/7375/7603/files/xolebivixijapugemomogas.pdf
    • https://cdn.shopify.com/s/files/1/0430/0403/5221/files/badokoji.pdf
    • https://cdn.shopify.com/s/files/1/0427/4572/5094/files/53244247917.pdf
    • https://cdn.shopify.com/s/files/1/0432/1561/8203/files/masapelorotobadu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40369191557.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/54727249179.pdf
    • https://cdn.shopify.com/s/files/1/0435/7763/9071/files/swing_trading.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8188/files/nomugona.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008f1a.bin
7247b535f058e581a329aa1c8554e12f720b8620c43df4cef1c29bd2b461dedc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F1A 5288 bytes
font_01_sfnt_off0000a0e6.bin
fe1488afebd07e6d1a61bd1fb561d52ed06b6f28c6f28ab82765b8088a6198ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0E6 15916 bytes
font_02_sfnt_off0000d2c9.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C9 4324 bytes

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