Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ed1a67e76d31b4…

MALICIOUS

PDF

43.2 KB Created: 2020-08-23 14:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db963c098b5c0d7e2d55cce09282fb58 SHA-1: 47edefdb1d54dd169a052a06dd7688fcc07ddbc8 SHA-256: 40ed1a67e76d31b45d8d5350734ec2a7a8a8d6dd99d298ea9b0bc0bc149ae84f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK, pointing to 'https://ttraff.com/pify?keyword=gu+portal+3rd+sem+result+marksheet'. This link is presented within the document body, disguised as a student portal result. The PDF also hosts a link farm, as indicated by PDF_SEO_LINK_FARM, with multiple links to external PDFs, many hosted on shopify.com. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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.com/pify?keyword=gu+portal+3rd+sem+result+marksheet
    • http://nokerowal.natalieasport.com/uploads/1/3/2/3/132302815/runejubukilat-kumibif-towepasu-fuwunuwegi.pdf
    • http://files.lifeofgraydon.com/uploads/1/3/0/8/130814717/dapikedopasujuterere.pdf
    • http://files.saluvetinnova.com/uploads/1/3/0/7/130739684/27330e62d5.pdf
    • https://cdn.shopify.com/s/files/1/0431/7052/9436/files/dajepufaruvedajevo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92399027362.pdf
    • https://cdn.shopify.com/s/files/1/0427/9838/3260/files/wofotokev.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/57137011938.pdf
    • https://cdn.shopify.com/s/files/1/0438/5941/1094/files/bafejezopulofoluzodumewu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5656/1318/files/39351147285.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7495/files/spin_routing_protocol_in_wsn.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/alcohol_consumption_questionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2858/files/29166615413.pdf
    • https://cdn.shopify.com/s/files/1/0430/6881/7562/files/very_bad_things_soundtrack.pdf
    • https://cdn.shopify.com/s/files/1/0432/7384/6947/files/guzerezimaxo.pdf
    • https://cdn.shopify.com/s/files/1/0460/4094/0708/files/definition_of_agricultural_economics.pdf
    • https://cdn.shopify.com/s/files/1/0435/1551/0952/files/dimomigivopuzoxafipifegeg.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_off00006a77.bin
c73aba43323ba095ed19ab932dffee5ad96c3e00be7fd7f0bcc47defc64393ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A77 5460 bytes
font_01_sfnt_off00007ce3.bin
5ac955f5da4494591ef56af445b80c24dd6d922b32e855c0d9fadd08455e4bc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE3 10256 bytes

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