Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24db281bb98cc82…

MALICIOUS

PDF

48.2 KB Created: 2020-08-04 13:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 293c9fe1dc4e020665a1508a5baba1a4 SHA-1: d1341894ad53d19c027c5bfc1cf222b0a7dad790 SHA-256: d24db281bb98cc82aae38b91ae4d7849a3d8c24412b544dea8b56edc109fabe8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector infrastructure at ttraff.ru. The document body, though heavily obfuscated, contains the same URL, suggesting the primary purpose is to redirect the user to malicious content. No scripts were extracted from this sample.

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=biochemical+test+for+staphylococcus+epidermidis+pdf
    • http://files.jimcasler.com/uploads/1/3/1/4/131452922/dasurefekibawav-fidegejisipubit.pdf
    • http://files.cochranedistricthortsociety.com/uploads/1/3/1/3/131380031/nasuvixiduw.pdf
    • http://files.neal-insurance.com/uploads/1/3/2/6/132696171/sifux.pdf
    • http://files.gingerstache.com/uploads/1/3/1/4/131438002/2006783.pdf
    • https://cdn.shopify.com/s/files/1/0434/3706/4344/files/6074506803.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7318/files/joxitasepitutawufajidu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0690/2950/files/47405451621.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3439/files/82321815415.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/50418590977.pdf
    • https://cdn.shopify.com/s/files/1/0437/8827/1773/files/bibliografia_de_vancouver.pdf
    • https://cdn.shopify.com/s/files/1/0433/7264/2460/files/lomunu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7453/5067/files/java_string_comparison.pdf
    • https://cdn.shopify.com/s/files/1/0433/6150/1336/files/zupagazemetut.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/american_association_of_blood_banks_technical_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/6914/4230/files/crack_dashboard_repair.pdf
    • https://cdn.shopify.com/s/files/1/0427/6197/8023/files/5603390847.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/kisatajoka.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9817/files/tojajaritajer.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/64989875230.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_off00007cea.bin
3ade989644f8b5f312f1293a4d50f29af13badab65027036c1da0d04d35769df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CEA 5544 bytes
font_01_sfnt_off00008fa0.bin
7ac4741584dc900a531db2540c03e36576dd54a34153e1159e031c3611177b8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA0 10404 bytes

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