Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1bba9bb486e0db…

MALICIOUS

PDF

37.2 KB Created: 2020-08-09 03:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99796041e16aac954c7354ec7efb5e6c SHA-1: 33c9426be6cfe2c1bd27ff059c4721cd702fd5a4 SHA-256: ba1bba9bb486e0dbf2ec90d2a48172287954e5886530dde18314b4a8418429b1
150 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 link to 'ttraff.ru'. The document body, though partially corrupted, contains text suggesting it is disguised as an 'application letter for ojt sample pdf'. This indicates a social engineering attempt to trick the user into visiting the malicious URL, likely to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=application+letter+for+ojt+sample+pdf
    • http://files.alekkosinski.com/uploads/1/3/1/4/131438379/3502622.pdf
    • http://files.paintballparadisebend.com/uploads/1/3/1/4/131456012/fixujifuwaxep-susoj-xuratoz.pdf
    • http://files.ccsdetroit.org/uploads/1/3/1/4/131406288/jovej.pdf
    • http://files.gammaetaomegaaka.org/uploads/1/3/1/6/131636990/5608641.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1513/files/carol_of_the_bells_piano_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/7945/0272/files/15555512200.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/nejokupepe.pdf
    • https://cdn.shopify.com/s/files/1/0435/8999/2605/files/dobezosiri.pdf
    • https://cdn.shopify.com/s/files/1/0431/9949/6351/files/the_student_pilot_s_flight_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/nisatale.pdf
    • https://cdn.shopify.com/s/files/1/0438/5862/4672/files/13785921348.pdf
    • https://cdn.shopify.com/s/files/1/0428/1463/6198/files/85717251850.pdf
    • https://cdn.shopify.com/s/files/1/0431/1541/3661/files/vajanino.pdf
    • https://cdn.shopify.com/s/files/1/0428/9629/4051/files/4639776430.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_off00004655.bin
8111913ae475e995c4d8729be4db17dc968c700f870964273e9f6d3a60fec9e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4655 5156 bytes
font_01_sfnt_off000057b6.bin
f1bded21fcb6dcb55f4ec2d7f60d6e87cfbf12861e76f14e8016cfe0ba123aba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57B6 10048 bytes
font_02_sfnt_off00007a25.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A25 4324 bytes

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