Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55a74fb8b0f208c…

MALICIOUS

PDF

50.6 KB Created: 2020-08-09 16:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f532a92a36f24da8908b995537f69995 SHA-1: 85f3ea97a709f338fb5a448b386cbb0ac2c21b6f SHA-256: b55a74fb8b0f208c39de33951732a6901a3cc41cbe5283fa059ae55969a73d03
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'public speaking samples pdf' and a URL that appears to be part of a link farm designed to manipulate search engine results. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to malicious infrastructure via these links.

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=public+speaking+samples+pdf
    • http://files.sshcr.co.uk/uploads/1/3/1/4/131453111/gokewikomux.pdf
    • http://files.yourgolfdna.com/uploads/1/3/1/3/131384113/2567004.pdf
    • http://fatuxova.sacredvoicestudios.com/uploads/1/3/0/7/130776177/4323835.pdf
    • http://files.comicbookposer.com/uploads/1/3/0/7/130776063/fb532.pdf
    • http://files.comicbookposer.com/uploads/1/3/0/
    • https://cdn.shopify.com/s/files/1/0435/7590/2363/files/11967841039.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3363/files/air_force_form_910.pdf
    • https://cdn.shopify.com/s/files/1/0432/4484/7261/files/zimuzugugurelas.pdf
    • https://cdn.shopify.com/s/files/1/0428/5349/9046/files/pathfinder_race_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/0924/4316/files/83737389630.pdf
    • https://cdn.shopify.com/s/files/1/0433/9885/6871/files/pabuvug.pdf
    • https://cdn.shopify.com/s/files/1/0429/9938/2170/files/58843878928.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/4827277057.pdf
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/89511462105.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/fexinudurerurufelix.pdf
    • https://cdn.shopify.com/s/files/1/0436/0624/5534/files/32708014691.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4977/files/25208160419.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/kufopitemejirinaveka.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_off0000874a.bin
0099969613213e4739cfaf1a1cc9f523c82611792c679dc478b094f0872447ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x874A 5584 bytes
font_01_sfnt_off00009a3c.bin
e62ad9666531f62fd82ad73f8cdebf693981ec72c8030b831adcabbc8c4970d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A3C 10288 bytes

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