Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a5c2fe0466d543…

MALICIOUS

PDF

42.0 KB Created: 2020-08-13 03:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 481b21677de52e41c83ed187b2e1b016 SHA-1: 628d20c9978509ae550ab86a147fa104bb8132e6 SHA-256: 09a5c2fe0466d5431e83927dc1528e5ea23604b1a54c8b8174c9e64aeed561db
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector at 'ttraff.com'. The document body, though obfuscated, contains text suggesting it's a resignation letter, likely a lure. The ML classifier and heuristic firings strongly indicate malicious intent, with the primary goal appearing to be redirecting the user to malicious infrastructure.

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/wb?keyword=surat%20pengunduran%20diri%20dari%20organisasi%20pdf
    • http://lujir.refugeriders.org/uploads/1/3/0/9/130969742/xigujidat-wanaguresiso.pdf
    • http://files.livingvoice.ca/uploads/1/3/0/7/130776413/jeremedisaxugobefapa.pdf
    • http://files.virginianimarkoh.net/uploads/1/3/2/7/132740541/salamoduje-pejesonuvaka-tidutisazowonu-kulutuker.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2515/4716/files/letesobofodevil.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2421/files/minecraft_giant_oak_tree.pdf
    • https://cdn.shopify.com/s/files/1/0429/5386/7427/files/25838966637.pdf
    • https://cdn.shopify.com/s/files/1/0433/9957/7756/files/understanding_architecture_through_drawing_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/9715/9832/files/63527552680.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/pnpk_abortus.pdf
    • https://cdn.shopify.com/s/files/1/0440/7925/1608/files/2096309541.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/6075157861.pdf
    • https://cdn.shopify.com/s/files/1/0427/3229/0215/files/zoviruzikonobuna.pdf
    • https://cdn.shopify.com/s/files/1/0432/5913/4112/files/tipos_de_generadores_eolicos.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/nefopekuda.pdf
    • https://cdn.shopify.com/s/files/1/0430/2651/4077/files/riwuvifiw.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e4a.bin
ee798515d6c32f99a6d644d06f40c8d24518c194c29c1034c63b6f2a5a7c4148		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E4A 5280 bytes
font_01_sfnt_off00007043.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7043 1800 bytes
font_02_sfnt_off000078cf.bin
5cf7ffd374abadd8b05a9c0fc8179ab3d1b71e66be7306eb10f286d03daeb5f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78CF 9872 bytes

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