Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7f4cdd585dac22…

MALICIOUS

PDF

44.6 KB Created: 2020-07-10 08:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb0cbf06f338c5783086e9910de7cacc SHA-1: 1baaba83d672b7a3469fce2937c98469a66bec66 SHA-256: eb7f4cdd585dac22e76323055aae064c7472a4781d252950ea0535a6e6a63ce3
154 Risk Score

Malware Insights

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

The PDF document is identified as malicious by a machine learning classifier and contains numerous embedded links. One link, 'https://ttraff.com/wb?keyword=como%20hacer%20un%20cv%20simple%20pdf', appears to be a redirector. The document also exhibits characteristics of a PDF SEO link farm, with many links pointing to external PDF files, such as 'http://files.atkinsreddevils.org/uploads/1/3/0/7/130738991/mujutokebo.pdf'. The document body, though partially obfuscated, suggests a lure related to creating a simple CV, which is a common tactic for phishing or malware delivery.

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/wb?keyword=como%20hacer%20un%20cv%20simple%20pdf
    • http://files.atkinsreddevils.org/uploads/1/3/0/7/130738991/mujutokebo.pdf
    • http://files.spillwaycollective.com/uploads/1/3/0/7/130739362/7244109.pdf
    • http://files.absolutetime.net/uploads/1/3/2/7/132740564/a76e31b3e6fecf5.pdf
    • http://files.evassociation.org/uploads/1/3/2/7/132740586/bd5fdfac.pdf
    • http://files.3ringbinder.org/uploads/1/3/1/4/131482937/7753716.pdf
    • http://files.yunkawasiperu.org/uploads/1/3/1/3/131379612/vizarifogumawov.pdf
    • http://files.divinesoulenergy.com/uploads/1/3/0/9/130969819/d55ccdadbe3c.pdf
    • http://files.accordingtoandrewblog.com/uploads/1/3/1/6/131637168/9115309.pdf
    • https://tejunif.files.wordpress.com/2020/07/79751661385.pdf
    • https://pekakupesile.files.wordpress.com/2020/06/26244765913.pdf
    • https://devozepapake.files.wordpress.com/2020/07/3560784664.pdf
    • https://bezubed.files.wordpress.com/2020/07/xavisak.pdf
    • https://taletabito.files.wordpress.com/2020/06/tivamodasopijiliwug.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24803542318.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tipibag.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mipin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67264452348.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98973723668.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_off00006415.bin
f0beb6b75ba42dc3c15c4ae1316e95448b36b7e92a040240c66c951be1f75f48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6415 5280 bytes
font_01_sfnt_off000075d6.bin
4868153f5200892d8b9aa9611a808359786363d700a53a2c7677fa04903726c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75D6 2248 bytes
font_02_sfnt_off0000802b.bin
f8fd84d24f5b6f7ecfd43113a4f3f7892a49381248c680b0914c90b3319c4edc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x802B 11000 bytes

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