Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85a76696aed6faa…

MALICIOUS

PDF

41.8 KB Created: 2020-08-01 08:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d866209e048df8885371b553057c6e8 SHA-1: 6a823060c4827941cc3e0e9b5c05030ffa38b189 SHA-256: f85a76696aed6faab1dcee162588207d69cd230fdcbd7b3f15ff3c129f07d1ce
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=stevens+320+security', which is flagged as a malicious redirector. Additionally, numerous links to external PDFs hosted on domains like cdn.shopify.com and various other file-hosting sites were extracted, indicating a potential link farm or distribution mechanism. The ML classifier also strongly flagged this PDF as malicious.

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=stevens+320+security
    • http://files.blueactiondems.com/uploads/1/3/0/8/130814711/morajes.pdf
    • http://files.mavesathletics.com/uploads/1/3/2/7/132710669/piwesubebolu.pdf
    • http://files.rootandbranchcollective.com/uploads/1/3/0/8/130874197/4176001.pdf
    • http://files.clarkkentcreations.com/uploads/1/3/0/7/130739974/nijenabokemogetotiw.pdf
    • http://files.yilisdelcarmensuriel.com/uploads/1/3/0/7/130775628/30f8497e8cb11a.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinavupomun.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/80383247651.pdf
    • https://cdn.shopify.com/s/files/1/0437/1863/9765/files/princes_of_the_apocalypse_full_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/7749/1105/files/769680088.pdf
    • https://cdn.shopify.com/s/files/1/0435/5378/3957/files/zorajomugijexok.pdf
    • https://cdn.shopify.com/s/files/1/0431/9477/7757/files/disajurukonetumisifik.pdf
    • https://cdn.shopify.com/s/files/1/0432/6581/8789/files/web_assign_osu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2955/2552/files/borderlands_2_mouse_sensitivity.pdf
    • https://cdn.shopify.com/s/files/1/0428/8839/6959/files/92832067513.pdf
    • https://cdn.shopify.com/s/files/1/0432/4084/9575/files/50419856313.pdf
    • https://cdn.shopify.com/s/files/1/0435/5335/7985/files/mamivogu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9845/4693/files/99012142734.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_off000065d8.bin
96bf442ed1d16a50d4013f0d11f1a35400f9ee811af6d3c82dc6d064fe5e39f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65D8 5256 bytes
font_01_sfnt_off000077d8.bin
a447b54a3a99184ff79b9aeb669688e83cc7f78ef2d37b2723c25bf9d84557b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77D8 10164 bytes

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