Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc681acaadc13b8…

MALICIOUS

PDF

42.7 KB Created: 2020-08-12 00:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6457f6f7f10d4f5905d6605f3e62b8d SHA-1: de2371f22054f7e96347d12d1d3cea2548cd3deb SHA-256: 6bc681acaadc13b86da1ed1d04be5a7c5ada1fc324dbd356b71074638e59e2d1
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to a 'digital photography complete course'. The primary malicious URL, https://ttraff.ru/pify?keyword=digital+photography+complete+course+by+dk+publishing+pdf, is a strong indicator of a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=digital+photography+complete+course+by+dk+publishing+pdf
    • http://files.ericaveryartist.com/uploads/1/3/0/7/130775867/jedaxixabaxeza-kubazo-xikoz-fegonetazowuseg.pdf
    • http://files.degraffumc.org/uploads/1/3/1/1/131163559/60c7140a.pdf
    • http://rimoneduv.mrsfaoro.com/uploads/1/3/0/9/130969426/puvakesunilutelesage.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/5764/2648/files/6th_grade_science_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/0438/5686/files/93576416238.pdf
    • https://cdn.shopify.com/s/files/1/0433/4351/1706/files/rijowufupefaxiwababitube.pdf
    • https://cdn.shopify.com/s/files/1/0429/7405/2503/files/64584391122.pdf
    • https://cdn.shopify.com/s/files/1/0435/3681/0152/files/ketimimevepi.pdf
    • https://cdn.shopify.com/s/files/1/0440/6090/1526/files/world_map_with_countries_and_cities.pdf
    • https://cdn.shopify.com/s/files/1/0451/8638/4023/files/34047269415.pdf
    • https://cdn.shopify.com/s/files/1/0435/8039/1583/files/15679196766.pdf
    • https://cdn.shopify.com/s/files/1/0431/7013/6218/files/91827287190.pdf
    • https://cdn.shopify.com/s/files/1/0431/4474/1015/files/definition_of_international_business_management.pdf
    • https://cdn.shopify.com/s/files/1/0432/9917/6612/files/nozaxifu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tolipokegegami.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a68.bin
c1bf4c200071ba66533b4c0edcf480c226a153e19250ed3d2c914b04b308ed22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A68 5756 bytes
font_01_sfnt_off00006dd5.bin
3247db34348855be6501b7c136c64b41a2ffddabc56f9dad105a3d4c318a5de8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD5 9812 bytes
font_02_sfnt_off00008f58.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F58 4324 bytes

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