Malicious PDF — malware analysis report

Static analysis result for SHA-256 53adcd4a43d4462b…

MALICIOUS

PDF

48.3 KB Created: 2020-08-10 03:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e551fcd72566b3cdb500247b069f7d94 SHA-1: 2f4487872378ff07d3fd9516110ad9102792a111 SHA-256: 53adcd4a43d4462bc2e04301fe73879e223e78ecb0889e1e3aa7fda4dcc12d15
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector. The presence of numerous external links suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites.

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=rti+format+in+marathi+pdf
    • http://files.sethgangwer.com/uploads/1/3/1/4/131438002/totujovopewarone.pdf
    • http://files.heathercoleman.co.uk/uploads/1/3/0/7/130775249/xilasojajod.pdf
    • http://files.innovationsbuildingservices.com/uploads/1/3/1/4/131438741/3ca2f8128cf.pdf
    • http://files.mommyinla.com/uploads/1/3/1/3/131383283/bikedenuxogobifa.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6774/files/tnpsc_assistant_system_engineer_notification.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5805/files/define_economic_growth.pdf
    • https://cdn.shopify.com/s/files/1/0435/5896/1320/files/5241951991.pdf
    • https://cdn.shopify.com/s/files/1/0429/7116/8931/files/farimimorox.pdf
    • https://cdn.shopify.com/s/files/1/0434/8638/0189/files/diwuve.pdf
    • https://cdn.shopify.com/s/files/1/0431/6754/7552/files/15050984977.pdf
    • https://cdn.shopify.com/s/files/1/0431/9612/1252/files/durability_of_concrete.pdf
    • https://cdn.shopify.com/s/files/1/0434/2333/4565/files/nudesawumobazixebejekaja.pdf
    • https://cdn.shopify.com/s/files/1/0433/7932/7130/files/82396345224.pdf
    • https://cdn.shopify.com/s/files/1/0429/5563/6889/files/duzowawet.pdf
    • https://cdn.shopify.com/s/files/1/0434/5652/8537/files/wurefefamekonosup.pdf
    • https://cdn.shopify.com/s/files/1/0434/2392/4376/files/authentic_leadership_characteristics.pdf
    • https://cdn.shopify.com/s/files/1/0432/2626/7816/files/73379232189.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/280680.pdf
    • https://cdn.shopify.com/s/files/1/0438/3218/0893/files/40585177666.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_off00006346.bin
32ca7b5adafcc873430c889a88faa11ac04121995b0b2c1093792d8d74371f7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6346 5076 bytes
font_01_sfnt_off00007462.bin
6cd8816b57f22ceceb87cb714f78790b370ff0f0750461eaff2a8c1c78b32809		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7462 12368 bytes
font_02_sfnt_off00009cf3.bin
4fc0fc6b31c4a05b045649f3d198e13bfc7b71428c516ddfaee793e04da433a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CF3 6408 bytes

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