Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0870b31327596e…

MALICIOUS

PDF

38.0 KB Created: 2020-08-20 13:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2ebf67598264ee17cc9bc7d08b399af SHA-1: 9ecdfecd45f562697e4af7b3e423afe4f0066bfd SHA-256: 4a0870b31327596e90df10827a05260d1927dfe2846d3368fff022aa022fc5d7
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 of the primary links, 'https://ttraff.ru/pify?keyword=naruto+vs+pain+theme+song', is flagged as a malicious redirector. This suggests the document's purpose is to lure users into clicking these links, ultimately leading them to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=naruto+vs+pain+theme+song
    • http://gomujuwa.saintjohnveinclinic.com/uploads/1/3/0/7/130776088/zesufuwupali_wakagex_vanejekaz_pepowareniwuma.pdf
    • http://files.aquazooextremepets.com/uploads/1/3/1/8/131858044/merizomonogeg-gemojelozoga.pdf
    • http://files.workofartstudios.com/uploads/1/3/2/6/132681342/ribilakisuve.pdf
    • http://files.rockypointboatdock.com/uploads/1/3/1/8/131856121/xefuvesufasa.pdf
    • http://niritebas.rebeccafarleyphotography.com/uploads/1/3/1/8/131857523/bemodawo-jemepiv-gipibujupuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/27551271485.pdf
    • https://cdn.shopify.com/s/files/1/0429/4619/9711/files/33489017508.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/27045038397.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/grau_dos_adjetivos_em_ingles_exercicios.pdf
    • https://cdn.shopify.com/s/files/1/0431/2023/0564/files/juvixawux.pdf
    • https://cdn.shopify.com/s/files/1/0438/6743/9259/files/boris_gelfand_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/0290/4222/files/molemenovir.pdf
    • https://cdn.shopify.com/s/files/1/0435/4303/6053/files/formation_anesthesie_dentaire.pdf
    • https://cdn.shopify.com/s/files/1/0429/9636/7511/files/ruzujisala.pdf
    • https://cdn.shopify.com/s/files/1/0432/2400/6820/files/developing_mathematical_thinking.pdf
    • https://cdn.shopify.com/s/files/1/0432/9819/3573/files/i_78_traffic.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0326/files/fopofokebazazaxek.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_off000055ee.bin
3e6b782c1539eb4105a5fe347135cb0f50c7152f0d142c5b7d1d6c4ce21c9ab8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55EE 5232 bytes
font_01_sfnt_off0000679b.bin
8aa6ee3b2c0af019057d08c3d4baea5419c0b5d3d360e9777afa8399bfd28d84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x679B 10340 bytes

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