Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea53f92b64c2a7bb…

MALICIOUS

PDF

50.5 KB Created: 2020-09-07 18:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfcf9a549119dd1b11a87828d04d4fbc SHA-1: 850b5cbee420e0842d641e8a2cd23a5632eafbd5 SHA-256: ea53f92b64c2a7bb29bf6bb2e3efd168d20990220d7094dcdb7563fddd6ff842
152 Risk Score

Malware Insights

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

The PDF was flagged for containing a malicious redirector link and a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The primary malicious URL, https://ttraff.me/wix?keyword=learner+profile+template, is a known redirector. The document body contains garbled text but also repeats the malicious URL and several benign-looking Shopify URLs, likely part of the link farm.

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.me/wix?keyword=learner+profile+template
    • https://cdn.shopify.com/s/files/1/0440/3236/0613/files/felda_global_ventures_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0440/8072/6168/files/fevuzumonenuxokogubagut.pdf
    • https://cdn.shopify.com/s/files/1/0435/4995/0111/files/c1_grammar_exercises_with_answers.pdf
    • https://static.usrfiles.com/ugd/4dd980_1b08c01fe0c1497aa22ff7c4852ecfb2.pdf
    • https://static.usrfiles.com/ugd/cfa91a_a5994ed786b448659638a4247843585e.pdf
    • https://static.usrfiles.com/ugd/6a44d8_7ea9f42a4e484b0b9cce1b64ea695689.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/soxoloxawogo.pdf
    • https://cdn.shopify.com/s/files/1/0449/6467/5752/files/school_mate_2.pdf
    • https://cdn.shopify.com/s/files/1/0432/8947/7278/files/65485553846.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/65900084882.pdf
    • https://cdn.shopify.com/s/files/1/0437/9806/9410/files/pegijewoxajuzipojizigiw.pdf
    • https://cdn.shopify.com/s/files/1/0435/2891/3055/files/25684746210.pdf
    • https://cdn.shopify.com/s/files/1/0439/5125/9803/files/cnn_philippines_male_reporters.pdf
    • https://cdn.shopify.com/s/files/1/0431/2091/8679/files/47883569140.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/xusosudokil.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_off0000738c.bin
66f984dcce694b77ac777232a96f6b8b1719c94e223131587b0c5b1c88bca322		 pdf-font-stream PDF embedded font (sfnt) at offset 0x738C 4812 bytes
font_01_sfnt_off000083db.bin
9edd79727940c40840a769c717bf8ec78780bd26ce85b5b96f1e900fb77f7324		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83DB 10444 bytes
font_02_sfnt_off0000a7b5.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7B5 16204 bytes

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