Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd755e25ccab8144…

MALICIOUS

PDF

44.7 KB Created: 2020-09-22 00:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfc3ef538ba97c0ce6bc05b85289de44 SHA-1: a06398c0ddebf15e570280b4d1d1005836a07440 SHA-256: bd755e25ccab8144ac160268be5cabfa6e53cc32bd76c2633833044c4a229480
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though partially garbled, contains text suggesting a 'notice of termination' lure, which is consistent with phishing or malware distribution. The ML classifier also 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.me/wix?keyword=notice+of+termination+dragon+age
    • http://files.roberthillpsychologist.com/uploads/1/3/2/8/132814791/tasunenixa.pdf
    • http://remadajog.hoacopperfield.com/uploads/1/3/0/7/130738973/barugo.pdf
    • http://files.poplutheranva.org/uploads/1/3/0/7/130738960/nelides.pdf
    • http://petefera.phenomenaltransformation.com/uploads/1/3/1/3/131398234/vudomavubewo.pdf
    • http://pibisa.deltacouncil.org/uploads/1/3/1/3/131380001/zomiw-numudokuzeniko-pivogudor.pdf
    • https://296eb524-fe53-49bd-af63-39337a5460f0.filesusr.com/ugd/7dd30d_0169cdd873f347978ad0bd126d65ab2e.pdf?index=true
    • https://bc85e22f-ca43-4a24-9641-14a1248de5f0.filesusr.com/ugd/c33cdb_f15645222ac34125aecd41c61b5d3387.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0439/3448/2587/files/warhammer_40k_death_guard_codex_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/31940042630.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37263727017.pdf
    • https://66cf7d8e-3e30-4c2f-86f9-947ff7a81f4f.filesusr.com/ugd/74e9cf_60d8b0340ba64363a247e0941ca07baf.pdf?index=true
    • https://8cdeeeb8-70a8-4e06-a896-4c3ffe653359.filesusr.com/ugd/5360f8_7b6f637d6b364fce85aa15d798b96852.pdf?index=true
    • https://b4efa75a-b8fd-48c5-87c4-b71602b6b949.filesusr.com/ugd/c67d0c_757aaa77ddaa4f81abe999d48bd16a42.pdf?index=true
    • https://8af4c181-17da-4b9c-81c2-cfd045e85dec.filesusr.com/ugd/98e2de_d8618b232bec49e0aa2152f2b61c48f5.pdf?index=true
    • 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_off000062d7.bin
cb6d59d7d4658d54e18c82fcbbb8e955190f826718d39e5a8ca3068ea566b109		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D7 4888 bytes
font_01_sfnt_off00007350.bin
edcc70c100277a088d5709091f915d7bcbc021d27f656883d917bbc29fbe91b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7350 10904 bytes
font_02_sfnt_off0000981d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x981D 4324 bytes

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