Malicious PDF — malware analysis report

Static analysis result for SHA-256 2258c3a405824d86…

MALICIOUS

PDF

52.4 KB Created: 2020-08-06 21:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23fbf099667e46152d8f805fa0181e69 SHA-1: 077c7fa0819ff4889a0495cca7da933881dd6693 SHA-256: 2258c3a405824d86a436f64eb1045d1e85218e4e8950fec3f420acaef3bb2bcf
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a 'biodata format for marriage free download pdf'. The document body and embedded links point to a large number of PDFs hosted on Shopify, likely as part of an SEO link farm to obscure the malicious redirector. The ML classifier strongly indicated maliciousness.

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.com/pify?keyword=biodata+format+for+marriage+free+download+pdf
    • http://files.mudnessceramics.com/uploads/1/3/1/6/131606056/dff0c5510b2875c.pdf
    • http://files.trader-lee.com/uploads/1/3/1/0/131070351/mofupebasemesedula.pdf
    • http://files.littlepodcastontheprairie.com/uploads/1/3/2/7/132740377/dexogusaj.pdf
    • http://files.beckedout.com/uploads/1/3/0/8/130813094/dezigakisetud_senefexaribugob_soburekemavaje_totakenijowo.pdf
    • https://cdn.shopify.com/s/files/1/0427/5693/1751/files/argumentao_e_linguagem.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53262414385.pdf
    • https://cdn.shopify.com/s/files/1/0433/1955/8299/files/ahead_of_the_curve_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/fuwonidobi.pdf
    • https://cdn.shopify.com/s/files/1/0438/0409/8722/files/68581434929.pdf
    • https://cdn.shopify.com/s/files/1/0428/9203/4211/files/waxutugutapunudepituv.pdf
    • https://cdn.shopify.com/s/files/1/0437/3302/4929/files/454_crusader_marine_engine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/4796/7130/files/74922856757.pdf
    • https://cdn.shopify.com/s/files/1/0433/6487/6444/files/42597570891.pdf
    • https://cdn.shopify.com/s/files/1/0439/0286/1464/files/dizirisedufenewenimixas.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/9102771164.pdf
    • https://cdn.shopify.com/s/files/1/0432/1571/6519/files/tipo_de_investigacion_cualitativa_descriptiva.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_off00008f20.bin
d9a7cba7b473c5c6579bed4e02fd9843b1dfc2391b7c1cc26be88cf450047273
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F20 5324 bytes
font_01_sfnt_off0000a144.bin
85cf7ec928637cb4a10d78c9f01881bd717fb6ea3b9681bdec396babb95c0bea
pdf-font-stream PDF embedded font (sfnt) at offset 0xA144 10192 bytes