Malicious PDF — malware analysis report

Static analysis result for SHA-256 645e5656486f20d3…

MALICIOUS

PDF

45.1 KB Created: 2020-08-21 14:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6779a947de5250c11942786eae3285cd SHA-1: cb5c5dbb1912508010bd79f332ae4798a47df1dc SHA-256: 645e5656486f20d3eef1cfa3d4d2dbc826a473b3f2945574aa8f0ddb490de23d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though obfuscated, contains URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or direct users to malicious sites. The presence of embedded URLs and the link farm heuristic indicate 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=eu+definition+of+balance+sheet+total
    • http://rilag.steadfastleaders.org/uploads/1/3/2/8/132815806/6310961.pdf
    • http://files.senkohrs.com/uploads/1/3/1/6/131637047/gimunemuzukaz.pdf
    • http://files.oliviacliftonbligh.com/uploads/1/3/1/3/131398036/jovanazegi.pdf
    • http://files.trimaccompanies.com/uploads/1/3/0/7/130776567/9374df6c27134a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0431/8871/5682/files/97875319432.pdf
    • https://cdn.shopify.com/s/files/1/0432/2980/6759/files/merenorukavovobatibakof.pdf
    • https://cdn.shopify.com/s/files/1/0429/4931/2666/files/kezomozixaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15636630427.pdf
    • https://cdn.shopify.com/s/files/1/0452/0479/9639/files/xeforajuziloferamon.pdf
    • https://cdn.shopify.com/s/files/1/0435/0384/5541/files/17518959166.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/zunajaraxilafufagok.pdf
    • https://cdn.shopify.com/s/files/1/0434/6327/8758/files/einkommensteuererklrung_2020_anlage_er.pdf
    • https://cdn.shopify.com/s/files/1/0434/3031/4151/files/64152517912.pdf
    • https://cdn.shopify.com/s/files/1/0431/1433/2309/files/rogonix.pdf
    • https://cdn.shopify.com/s/files/1/0433/8994/3971/files/arcanos_maiores_tarot.pdf
    • https://cdn.shopify.com/s/files/1/0431/1593/7948/files/36068160631.pdf
    • https://cdn.shopify.com/s/files/1/0436/9232/7077/files/connect_echo_to_wifi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8529/1937/files/gomirabepag.pdf
    • https://cdn.shopify.com/s/files/1/0427/9848/1564/files/74088787212.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_off00006280.bin
5a0528d241d322f96094401ae59208363fd512318f7ecbe0f7195205e3df8709		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6280 5112 bytes
font_01_sfnt_off000073d9.bin
1b3745a368c25e461f7fc5c0aca53f743c56e945340b7603ad63ec9d82d48d08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D9 3836 bytes
font_02_sfnt_off00008257.bin
8a576555fe51c17595ec0cc75e5c1b9b30a3ef8e491138ec6278f23dd4e57c5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8257 11020 bytes

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