Malicious PDF — malware analysis report

Static analysis result for SHA-256 371a31730021c8dd…

MALICIOUS

PDF

41.4 KB Created: 2020-10-09 09:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35e4f512374b36306027d6718493e00d SHA-1: 29b7d38456b658eb010cedfdd3919b7d0654b1ce SHA-256: 371a31730021c8dd8b26e1ff62e19a2c8f0e2309c45248cc580d6580a2b5f99e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'My homework lesson 6' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of many external PDF links further indicates a link farm or redirection strategy.

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://cctraff.ru/strik?keyword=my+homework+lesson+6
    • http://lerozat.tlconnectedlearners.com/uploads/1/3/2/6/132680903/5924606.pdf
    • http://files.kittskreations.com/uploads/1/3/0/9/130969845/nofav.pdf
    • https://site-1036767.mozfiles.com/files/1036767/kajosakedixizokevuf.pdf
    • https://site-1042185.mozfiles.com/files/1042185/sovibazav.pdf
    • https://site-1037098.mozfiles.com/files/1037098/nixari.pdf
    • https://site-1048550.mozfiles.com/files/1048550/sofelibuwimezij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/48970e1d-9e49-449e-b250-839f95f49e62/suwibuzaxizuvasukewe.pdf
    • https://uploads.strikinglycdn.com/files/b161d498-d2a2-4c19-b147-f0d1a867ccb3/54619455932.pdf
    • https://uploads.strikinglycdn.com/files/e3de7021-d0a8-4b23-b0af-8d21457bc2bd/rorafesimojajemikikake.pdf
    • https://uploads.strikinglycdn.com/files/6579748e-8364-405c-97fa-9a40a73761c6/18814656866.pdf
    • https://uploads.strikinglycdn.com/files/4ab3473d-bca2-4e34-9218-72aa12429f8d/72683445368.pdf
    • https://cdn.shopify.com/s/files/1/0429/8201/5135/files/wizewu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6389/3416/files/crest_movie_theater_sacramento.pdf
    • https://cdn.shopify.com/s/files/1/0440/3170/5238/files/6235335935.pdf
    • https://cdn.shopify.com/s/files/1/0486/3072/6814/files/wolamekoregazure.pdf
    • https://cdn.shopify.com/s/files/1/0435/7105/2703/files/sotusaxoxusepu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006412.bin
9ccbad7ae108b8d29c6b22f75f573ce7b1792150149e212c8b69c34d6b38b263		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6412 5132 bytes
font_01_sfnt_off0000757e.bin
4e53e96cb35069c16296184ef3bc7f2e37a1185aac6fb9f10a3cea856426820a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x757E 10412 bytes

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