Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1c1c3c51a78b47…

MALICIOUS

PDF

59.2 KB Created: 2020-08-12 07:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 290241f44f1e477da69c8c2c257e4f5a SHA-1: 83cf5ea4cf4cf14129063035a254a1c4a07ef1fa SHA-256: 6c1c1c3c51a78b476ea6dcf7bc9aa1e88140cc6338b5254d7eec67c45b877c0b
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to a redirector infrastructure. The document body text, though partially obfuscated, suggests a lure related to 'graphing and data analysis worksheet answer key'. The primary malicious URL identified is https://ttraff.ru/wb?keyword=graphing%20and%20data%20analysis%20worksheet%20answer%20key, which is flagged as a known malicious redirector. The document's structure and the presence of numerous external links indicate a link farm or SEO poisoning tactic to distribute malicious content.

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/wb?keyword=graphing%20and%20data%20analysis%20worksheet%20answer%20key
    • http://files.westseattlecoworking.com/uploads/1/3/2/6/132695525/bumakufezebukalow.pdf
    • http://files.wpsla.net/uploads/1/3/1/3/131383648/kaxijusibefirov.pdf
    • http://files.sandysbeads.com/uploads/1/3/0/9/130969616/sugemip-basokebez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3903/8359/files/anatomia_de_la_carotida.pdf
    • https://cdn.shopify.com/s/files/1/0434/6766/9654/files/tetudedazipojanedi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0755/8310/files/97040730861.pdf
    • https://cdn.shopify.com/s/files/1/0432/9088/6312/files/mezevupelokutoziz.pdf
    • https://cdn.shopify.com/s/files/1/0435/3087/9125/files/gba4ios_ios_9._0._2.pdf
    • https://cdn.shopify.com/s/files/1/0430/9165/6855/files/fupun.pdf
    • https://cdn.shopify.com/s/files/1/0434/9886/4800/files/zufapo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2520/2325/files/45533099454.pdf
    • https://cdn.shopify.com/s/files/1/0432/1984/5278/files/diagnostico_ambiental_participativo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6102/6719/files/gilerawatetizurapadaluvek.pdf
    • https://cdn.shopify.com/s/files/1/0432/9088/6312/files/87656540298.pdf
    • https://cdn.shopify.com/s/files/1/0434/6445/8405/files/isotopes_ions_and_atoms_worksheet_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0437/2388/2645/files/rigexenu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a99b.bin
b176b5bd5c7715031af7291dc13f7b2187ae5f95721bf552afcac0a7162f1600		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA99B 5508 bytes
font_01_sfnt_off0000bc6b.bin
e18111bf8f939dae23268d82c5a4063b0d5b624d42da38f03f0f8c3354ee94a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC6B 10224 bytes

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