Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6fed5a3dfe7b41…

MALICIOUS

PDF

42.1 KB Created: 2020-08-09 17:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da72d82555ba7e95fcf5b476c82c7fef SHA-1: bb6409d4c33bf5c2b844eee0ae06db7a2daa8dc3 SHA-256: 3d6fed5a3dfe7b4156fde7cf6859e83debb26259c96c92f8625ba0766405313d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One of these links, https://ttraff.ru/pify?keyword=blank+white+sheet+pdf, is identified as a known malicious redirector. The document body text is obfuscated, but the presence of the malicious link and the heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK strongly indicate a phishing or redirection attempt.

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=blank+white+sheet+pdf
    • http://pafuresa.jackwarden.ca/uploads/1/3/1/6/131606027/4794989.pdf
    • http://files.oceanstatebirdclub.org/uploads/1/3/1/4/131455463/xurokuvibatix.pdf
    • http://files.paranormalread.com/uploads/1/3/2/6/132682235/7931767.pdf
    • http://tagijane.oandaeveryday.com/uploads/1/3/2/6/132681670/kepazexav.pdf
    • http://files.tracylarkindesign.com/uploads/1/3/1/1/131164052/woripobusavab-vizek-fuwiramuvemed.pdf
    • https://cdn.shopify.com/s/files/1/0438/0711/3373/files/authorship_of_the_book_of_hebrews.pdf
    • https://cdn.shopify.com/s/files/1/0437/2119/5688/files/tifutuza.pdf
    • https://cdn.shopify.com/s/files/1/0440/4533/6726/files/48364343643.pdf
    • https://cdn.shopify.com/s/files/1/0431/4664/1570/files/18297732637.pdf
    • https://cdn.shopify.com/s/files/1/0438/4053/6736/files/48_volt_battery_charger_circuit_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0429/4351/2732/files/30_beaglebone_black_projects_for_the_evil_genius.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46676539889.pdf
    • https://cdn.shopify.com/s/files/1/0437/1375/7339/files/fojixitezokudujido.pdf
    • https://cdn.shopify.com/s/files/1/0433/8352/1445/files/tutilalalugisutaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/trusting_god_jerry_bridges_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4630/files/45096239644.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8032/files/56748321614.pdf
    • https://cdn.shopify.com/s/files/1/0433/7732/8286/files/sevibotupekapirad.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_off00006705.bin
6a4f6a2b7709e6150922d52389520d70222345b8c5a2d4716435c424742e954f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6705 5236 bytes
font_01_sfnt_off000078ee.bin
b5a488f3d5af562b777ab0b705d3567b4e89d06ed6715f59c2e4a9fbc7958cdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78EE 10024 bytes

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