Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5d7cd844a3f87a…

MALICIOUS

PDF

41.7 KB Created: 2020-08-07 08:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f69986eb7ff7ea14c556ddb0e2b14370 SHA-1: 0edeb316ef36c30188573856628fe2d475a698fe SHA-256: 8c5d7cd844a3f87a83fd7f3b36ff1f9f7ab0775e39bf68e5f05cec126a22544e
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 ML classifier also strongly indicated maliciousness. The presence of a link to 'ttraff.com' which is flagged as a malicious redirector, and the sheer volume of links (30 detected) suggest a link farm or redirection scheme designed to lead users to malicious content. No scripts were extracted, but the PDF structure itself is the delivery mechanism.

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=appearance+flashcards+pdf
    • http://files.ignitemybizz.com/uploads/1/3/1/3/131380008/2652519.pdf
    • http://files.newteachersretreat.com/uploads/1/3/0/8/130815095/kenizibigonedunopof.pdf
    • http://files.thetalkativeteacher.com/uploads/1/3/1/4/131406701/8099a7e75.pdf
    • http://files.psepa.org/uploads/1/3/1/8/131871864/4d4c130f.pdf
    • https://cdn.shopify.com/s/files/1/0433/6074/7688/files/cation_exchange_capacity_practice_problems.pdf
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/36206971709.pdf
    • https://cdn.shopify.com/s/files/1/0434/1379/9066/files/tabodujakemixefinefenu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0783/5292/files/business_card_design_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0430/7392/9378/files/39788362634.pdf
    • https://cdn.shopify.com/s/files/1/0429/7519/9391/files/75535227105.pdf
    • https://cdn.shopify.com/s/files/1/0438/2110/5309/files/2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/6840/7464/files/nipevepo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4939/files/tomis.pdf
    • https://cdn.shopify.com/s/files/1/0439/4103/6200/files/harry_potter_in_french.pdf
    • https://cdn.shopify.com/s/files/1/0437/6566/1853/files/factorio_best_map_settings.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d4a.bin
2a8644edc132e0963b9008685dd1a0178c66b77e606abf53e1f2dc30879e1446		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D4A 3144 bytes
font_01_sfnt_off0000586c.bin
15441ec8fe3ec9ad610664d80a23365161be96b3a69382fb3f8d19ae89de803e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x586C 4784 bytes
font_02_sfnt_off00006892.bin
8f61243e05b464d970c00a09b9a0b51314c0c8392b4d5b6fa2a3d8f5961d60bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6892 10280 bytes
font_03_sfnt_off00008b9f.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B9F 4324 bytes

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