Malicious PDF — malware analysis report

Static analysis result for SHA-256 48690fb41d17a3cb…

MALICIOUS

PDF

51.8 KB Created: 2020-08-08 09:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 277fdedb60bb65467360372d60c5c2f0 SHA-1: 900ed6ae7ac3d1eb6d3ac7a086c3b6ef826dcd55 SHA-256: 48690fb41d17a3cbca15274e1102c8f88daa6a8c31028a2ac7f8b9c7bea9fdd7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though partially corrupted, includes the URL 'https://ttraff.ru/pify?keyword=alimentos+ricos+en+hierro+para+embarazadas+pdf', which is flagged as a malicious redirector. This suggests the document's primary purpose is to redirect users to malicious infrastructure, likely for phishing or to download further malware. The ML classifier also strongly flagged this PDF as malicious.

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=alimentos+ricos+en+hierro+para+embarazadas+pdf
    • http://files.mysailtalk.com/uploads/1/3/1/4/131454770/kenuluwulum_konojajimim_givenuzukev_xomixefetegitoj.pdf
    • http://files.institutotathagata.org/uploads/1/3/1/8/131871921/galix.pdf
    • http://files.phyllis-kirk.com/uploads/1/3/0/8/130874060/3977786.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/guwixaki.pdf
    • https://cdn.shopify.com/s/files/1/0430/9535/9642/files/26689490184.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zetuvoveluganimuwejipas.pdf
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/dofasidepelif.pdf
    • https://cdn.shopify.com/s/files/1/0429/9777/6543/files/ratovulivelekubose.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5224/files/38161690727.pdf
    • https://cdn.shopify.com/s/files/1/0428/1516/0487/files/slavery_in_usa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5553/8591/files/60067671425.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/79347736297.pdf
    • https://cdn.shopify.com/s/files/1/0431/7957/3414/files/mijuxedurede.pdf
    • https://cdn.shopify.com/s/files/1/0433/8306/2678/files/xobofenejuniropived.pdf
    • https://cdn.shopify.com/s/files/1/0440/9619/2664/files/active_learning_benefits.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_off00007b0c.bin
0558f9ef2d3c9b96006a0ab9c890dad41019281e1c5b0075141774db5081aed9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0C 5364 bytes
font_01_sfnt_off00008d0d.bin
09e3676201e00aacaf350c8c7f60838bc75dbeb12c8869f05c7ebc917d3803fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D0D 11412 bytes
font_02_sfnt_off0000b244.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB244 4324 bytes

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