Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4339858188d494…

MALICIOUS

PDF

83.7 KB Created: 2020-08-23 18:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 210a39d63e6fa929bc2f53ac92c02791 SHA-1: d06276b4cdbbfc5d7b1b7197cad2356f30f0e5de SHA-256: 0c4339858188d494ee3339b84b6fce43f0603adfc676751c12f8afefc8b9cafe
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links, many of which point to a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=chart+js+tooltip+format+value'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to redirect the user to a malicious site. No scripts were extracted, but the presence of malicious links indicates a likely phishing or redirection attack.

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=chart+js+tooltip+format+value
    • http://rudegifin.helpurchild.net/uploads/1/3/0/7/130776760/zijofot_poxipa_fijesujara_vigobezad.pdf
    • http://files.lenorathompsonwriter.com/uploads/1/3/1/4/131482864/midizatolaruvakugik.pdf
    • http://files.blackcommunityhousingservice.org/uploads/1/3/2/7/132740515/sarunegizamowigulali.pdf
    • http://falade.eibenteaching.com/uploads/1/3/2/6/132682974/dujakubatir-rawemeso-sawula.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8254/7361/files/29479270362.pdf
    • https://cdn.shopify.com/s/files/1/0445/5497/7444/files/440_287_5529.pdf
    • https://cdn.shopify.com/s/files/1/0429/6183/0037/files/jijifinozamewopigum.pdf
    • https://cdn.shopify.com/s/files/1/0438/0898/1152/files/39482061975.pdf
    • https://cdn.shopify.com/s/files/1/0429/8178/5753/files/integral_calculus_work_problems_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7204/files/cisco_catalyst_2960x-_24ts-_l_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/9910/2115/files/pedifovisimajarunenesubu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bijuwosozawubuvenokuzi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6580/2903/files/54452065386.pdf
    • https://cdn.shopify.com/s/files/1/0435/1442/9608/files/tositi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0056/0805/files/31962270657.pdf
    • https://cdn.shopify.com/s/files/1/0431/5978/1538/files/1591164398.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca10.bin
5e2978fa34ae94b94051a78df22d0cfaf00776bb3a2ac6276aa774996eefb141		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA10 16148 bytes
font_01_sfnt_off0000fe2c.bin
92f9607251a92abf58b5694e8a00beca94b0d4ad6e0886e16274212c79aaae58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2C 5180 bytes
font_02_sfnt_off00010fb7.bin
9d895683e6f6aa9ea1dafdf89b662ab7e843d7811dc64fc391bb05f59af3adae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB7 15920 bytes

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