Malicious PDF — malware analysis report

Static analysis result for SHA-256 714ba7b753036d0d…

MALICIOUS

PDF

46.7 KB Created: 2020-08-09 20:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f3687a42b5da150001909a8125640ec SHA-1: f5a9658421ee90abb401be2a0f332d00d3775612 SHA-256: 714ba7b753036d0d653d89e397d2bec15396f8d30c2986f5cb96d886770366d6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to a link farm designed to redirect users to potentially malicious content, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The primary malicious URL identified is ttraff.ru, which is used in conjunction with keywords suggesting free PDF downloads to lure victims. While no scripts were extracted, the PDF structure and embedded links strongly suggest a phishing or redirection attempt.

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=bandana+bib+pattern+free+pdf
    • http://files.salomonk.com/uploads/1/3/2/6/132681194/kewiwagos-pojoxem-xorive.pdf
    • http://files.customjazzycreationz.com/uploads/1/3/0/7/130739214/jomobabevuw-sedofejebajigun-tefifivamate.pdf
    • http://files.scottcherney.com/uploads/1/3/0/7/130739308/572242.pdf
    • http://files.a4ppodcast.com/uploads/1/3/0/9/130969371/sajimatujodad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7537/0136/files/63758074725.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7903/files/gasarodomajuj.pdf
    • https://cdn.shopify.com/s/files/1/0440/7679/4021/files/55897507268.pdf
    • https://cdn.shopify.com/s/files/1/0431/1053/1238/files/punctuation_worksheets_for_grade_7.pdf
    • https://cdn.shopify.com/s/files/1/0429/8126/1466/files/mp3_skullcandy_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/7664/0156/files/engineering_your_future_9th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/8344/7968/files/zojufeturuludirodaloroji.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/97663122184.pdf
    • https://cdn.shopify.com/s/files/1/0435/3975/9263/files/national_geographic_magazine_january_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/2562/9335/files/detur.pdf
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/54400505339.pdf
    • https://cdn.shopify.com/s/files/1/0433/6808/7717/files/jodutaxijogexo.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006406.bin
769c8ff0f515829934f2667fa2a765643b1d85e636128cf247a85a247474b177		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6406 5016 bytes
font_01_sfnt_off00007521.bin
e25b31803a9cd38611cdb931a6681348ba6d4a0a3356705daa6fa00c9706e371		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7521 10044 bytes
font_02_sfnt_off000097af.bin
aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97AF 16312 bytes

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