Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2f33748f89307e…

MALICIOUS

PDF

68.2 KB Created: 2020-08-13 23:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a69d087a8159a0f26d6e515ecaa90a2 SHA-1: 8c4a56f745843b257709ed65f0b6fc197e84ed3a SHA-256: 4f2f33748f89307e62b9bae75a3b2782ea73b98839d1311848830fcd4a28b7bb
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that leads to a redirector service, which is likely used to obscure the final malicious destination. The presence of numerous external links suggests a tactic to distribute malicious content or phishing lures.

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=bhangra+music+songs
    • http://files.socohomephotography.com/uploads/1/3/2/6/132695339/sunapogukila_lakeligo_bifasojusunoxe_tupugexex.pdf
    • http://files.soccerwithoutboundaries.com/uploads/1/3/0/7/130740591/gatojazexafife-suxeja.pdf
    • http://files.projectenrich.org/uploads/1/3/1/3/131380601/e191cc3a8b8c71.pdf
    • https://cdn.shopify.com/s/files/1/0429/8552/1311/files/12414519211.pdf
    • https://cdn.shopify.com/s/files/1/0448/3108/0605/files/pathogenesis_of_candida_albicans.pdf
    • https://cdn.shopify.com/s/files/1/0433/4583/8239/files/28065003478.pdf
    • https://cdn.shopify.com/s/files/1/0428/1987/9068/files/34997667345.pdf
    • https://cdn.shopify.com/s/files/1/0433/0982/6213/files/guvudoliguvora.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/gexap.pdf
    • https://cdn.shopify.com/s/files/1/0438/8388/8808/files/benefits_of_agritourism.pdf
    • https://cdn.shopify.com/s/files/1/0437/8689/5512/files/bernoulli_trials_example_problems.pdf
    • https://cdn.shopify.com/s/files/1/0438/8939/3816/files/araceli_ordaz_revista_h.pdf
    • https://cdn.shopify.com/s/files/1/0434/1514/2567/files/46623120960.pdf
    • https://cdn.shopify.com/s/files/1/0434/5580/7640/files/92903155285.pdf
    • https://cdn.shopify.com/s/files/1/0435/6092/7393/files/metabolismo_aerbico_y_anaerbico.pdf
    • https://cdn.shopify.com/s/files/1/0440/0971/7910/files/72455981902.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009429.bin
a0638caeb8afef69eff3b6696682898e9b0c561de4c9b9ed620120a395e724e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9429 6032 bytes
font_01_sfnt_off0000a8d9.bin
daeedc8f68745a354a85f6eae5b17b2f8c4cdcd2ceab5982c47e275e88c13deb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8D9 5228 bytes
font_02_sfnt_off0000ba6c.bin
fa2052679a216660b19744e0293bcdbfe04e365f3cd54b976a36951e8e1b12c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6C 2672 bytes
font_03_sfnt_off0000c5cd.bin
4892b00ecc3115e7a3b47cd7515062657b0709ad5e637adfb272dcf370c30bfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CD 11460 bytes
font_04_sfnt_off0000eb13.bin
27dda2d76045e0d7023a4063193853431e4de2aaa5498957590850aa9e78be10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB13 16736 bytes

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