Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7638ff8408831c…

MALICIOUS

PDF

114.7 KB Created: 2020-08-01 02:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f163ed3134900abb763d2d1d6ab30a35 SHA-1: 2c184182720b9294371d072bbeae3a18c80a69bb SHA-256: ad7638ff8408831cbf571e2b66fb7d541a45c0f54a7a4322d331bcaf84161c0c
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, many of which lead to a link farm hosted on cdn.shopify.com. One of these links, https://ttraff.ru/pify?keyword=fitbit+charge+manual, is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and a URL, suggesting an attempt to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=fitbit+charge+manual
    • http://files.venturecreationcafe.com/uploads/1/3/0/7/130739459/8994767.pdf
    • http://files.graysinslade.com/uploads/1/3/1/8/131856987/vonabofiwifula.pdf
    • http://files.portageresourceguide.com/uploads/1/3/1/6/131606644/8719065.pdf
    • http://files.dysartgoodsco.com/uploads/1/3/0/7/130775299/guves.pdf
    • http://files.virtualvacay.org/uploads/1/3/1/4/131437834/4dcb8ed344a295.pdf
    • https://cdn.shopify.com/s/files/1/0435/5555/3432/files/fowowumifa.pdf
    • https://cdn.shopify.com/s/files/1/0430/4008/0021/files/21853366820.pdf
    • https://cdn.shopify.com/s/files/1/0431/1344/7584/files/28527723244.pdf
    • https://cdn.shopify.com/s/files/1/0428/6421/4175/files/6897385238.pdf
    • https://cdn.shopify.com/s/files/1/0432/5523/4710/files/45344709646.pdf
    • https://cdn.shopify.com/s/files/1/0435/4772/1882/files/91298450531.pdf
    • https://cdn.shopify.com/s/files/1/0431/3602/4742/files/72345096390.pdf
    • https://cdn.shopify.com/s/files/1/0437/4098/7543/files/43519062008.pdf
    • https://cdn.shopify.com/s/files/1/0436/2112/2208/files/2001_chevy_venture_repair_manual_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/kukipuvivamedu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5313/8591/files/47160964652.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/virtual_gird_hd.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_off000184bb.bin
e406d9f38e178a3ebe4331b806c27bc27f7f95c6abc5964b4ef3c778ca97c7f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x184BB 5132 bytes
font_01_sfnt_off0001960c.bin
93cc17db96496d6a0764c224ff0fdfb37c828ef7ff3a8ab67fbbec8bd8a0336a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1960C 11552 bytes