Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d38ad83b2be82c…

MALICIOUS

PDF

51.1 KB Created: 2020-07-31 03:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b95759c23c61c8d6e62b89cf3c610d7 SHA-1: 42f48dd56327dd718f3899901f605d0fdf143116 SHA-256: 62d38ad83b2be82c4b10f26d9460e74fb1bd48405a35d5fd9991541d364ee0ef
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, with the primary link identified as a malicious redirector. The ML classifier strongly indicates maliciousness, and the presence of a 'download button' heuristic suggests a lure. The document body, though heavily obfuscated, contains text related to 'pdf download', reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=goldman+cecil+medicine+pdf+download
    • http://files.acmehempcompany.com/uploads/1/3/1/4/131437143/8722268.pdf
    • http://files.pennyroadpta.com/uploads/1/3/1/4/131483097/zijobimafasur.pdf
    • http://files.gcpageants.com/uploads/1/3/0/7/130740391/josajugerefibuvabani.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7003/7917/files/metafegozarekonivupusosal.pdf
    • https://cdn.shopify.com/s/files/1/0436/0385/3469/files/95610276835.pdf
    • https://cdn.shopify.com/s/files/1/0433/7215/0942/files/mojofebotusixadizikasomag.pdf
    • https://cdn.shopify.com/s/files/1/0440/3517/8661/files/gokodetobepupulebuvo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75609531209.pdf
    • https://cdn.shopify.com/s/files/1/0431/5394/8836/files/sarazipegelevedoges.pdf
    • https://cdn.shopify.com/s/files/1/0434/1393/0142/files/genetedusir.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2119/files/gujubatiluvosefivanu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/jitanajamafedukinozazogos.pdf
    • https://cdn.shopify.com/s/files/1/0432/1165/3277/files/99912707878.pdf
    • https://cdn.shopify.com/s/files/1/0437/7142/9016/files/xegusubilololiji.pdf
    • https://cdn.shopify.com/s/files/1/0431/0184/7708/files/75196535242.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_off00008127.bin
de61e8b963834ce932813f6d38ae94d5da81cee6a9d0f042a90fea3d1390434e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8127 4856 bytes
font_01_sfnt_off000091a0.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91A0 1800 bytes
font_02_sfnt_off00009a2d.bin
9e08341476a410159c07da438bc25fced701d42dd328b81dc45f1d98c4304582		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A2D 10684 bytes

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