Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4f1abe5c4c38f4…

MALICIOUS

PDF

41.8 KB Created: 2020-08-19 00:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9d81c56b12b5a0de5e70f0aa0cb49ec SHA-1: 2401f2bdbf6e6ef4945d64f22d80d4abfad60e07 SHA-256: 9e4f1abe5c4c38f46b06937180b122966afec22f0075ede7a5e7320c5adb1231
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body text, though partially corrupted, suggests a lure related to 'charitable contributions form 8283'. The presence of a link farm and a critical heuristic firing for a malicious redirector strongly indicate a phishing or redirection attempt. No scripts were extracted, limiting the analysis of further payload execution.

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=charitable+contributions+form+8283
    • http://files.projectautismcanada.com/uploads/1/3/1/1/131164425/nurovefukawuzix.pdf
    • https://cdn.shopify.com/s/files/1/0436/0385/3476/files/vivamo.pdf
    • https://cdn.shopify.com/s/files/1/0440/1935/1710/files/66481977266.pdf
    • https://cdn.shopify.com/s/files/1/0430/3591/8489/files/81987374090.pdf
    • https://cdn.shopify.com/s/files/1/0434/8185/8214/files/jexib.pdf
    • https://cdn.shopify.com/s/files/1/0432/6191/9390/files/46119347596.pdf
    • https://cdn.shopify.com/s/files/1/0432/8787/1646/files/fekatipexasif.pdf
    • https://cdn.shopify.com/s/files/1/0435/5588/1119/files/xazufe.pdf
    • https://cdn.shopify.com/s/files/1/0449/5890/8584/files/building_information_modeling_framework_for_structural_design.pdf
    • https://cdn.shopify.com/s/files/1/0435/6040/3103/files/resistance_band_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/2684/9700/files/vedisisezewo.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_off000064cb.bin
f15a1ccfa6f5a9aae0ff0ea09f5d7f2359e6c3443d0289e40f886dfa7b6af1d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64CB 5656 bytes
font_01_sfnt_off000077db.bin
b66e45273e0d99e70925d1e2d22fe47809ceaf571365581c867da7aaedab1ab7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77DB 10164 bytes

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