Malicious PDF — malware analysis report

Static analysis result for SHA-256 32f86572032612f1…

MALICIOUS

PDF

45.3 KB Created: 2020-08-13 04:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1395fe6c7e3f18791f7101453e04a9f4 SHA-1: e14d3a926321e7dbc9bd03e5c88bb7069be2f08b SHA-256: 32f86572032612f1fe5bd90f79bc59ccb0b024eb83ce9f43888f05a7c82edbec
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector at `ttraff.ru`. The document body, though heavily obfuscated, contains text related to a printer specification, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports a malicious distribution or phishing campaign.

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/wb?keyword=hp%20laserjet%20pro%20m402n%20specification%20pdf
    • http://loreter.pacifictraininggroup.com/uploads/1/3/1/4/131452883/losubopo.pdf
    • http://pugixa.zforschools.com/uploads/1/3/2/6/132680866/madomuta_xomedeguzuga_jazel_kenotitasib.pdf
    • http://files.thechampsvoice.com/uploads/1/3/2/7/132712235/pomobesikedurupur.pdf
    • https://cdn.shopify.com/s/files/1/0437/1172/5723/files/18269038786.pdf
    • https://cdn.shopify.com/s/files/1/0428/0736/1703/files/23229805885.pdf
    • https://cdn.shopify.com/s/files/1/0440/8757/4678/files/40922158853.pdf
    • https://cdn.shopify.com/s/files/1/0437/3626/8949/files/amar_ujala_news_paper_shimla.pdf
    • https://cdn.shopify.com/s/files/1/0432/9606/3643/files/wilisuvudorikigese.pdf
    • https://cdn.shopify.com/s/files/1/0435/6807/0824/files/14474651979.pdf
    • https://cdn.shopify.com/s/files/1/0432/7469/8902/files/genutawonut.pdf
    • https://cdn.shopify.com/s/files/1/0433/9158/2357/files/3._4_biogeochemical_cycles.pdf
    • https://cdn.shopify.com/s/files/1/0432/9183/6566/files/angielski_swka_chomikuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/59129116393.pdf
    • https://cdn.shopify.com/s/files/1/0438/5121/9104/files/85145404234.pdf
    • https://cdn.shopify.com/s/files/1/0431/8973/1479/files/astonishing_color_of_after.pdf
    • https://cdn.shopify.com/s/files/1/0428/1755/2543/files/dukoxemo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006480.bin
43bf545471d4b6c8da75425b654769dc29106fffdfba8574ddeca7c9f0d0cf81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6480 5488 bytes
font_01_sfnt_off0000770f.bin
88fa5fe6c9c5a398240ac8c37b185a5b89977a1930bdcc57e980f1cead7ebe47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x770F 10256 bytes
font_02_sfnt_off000099fc.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99FC 4324 bytes

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