Malicious PDF — malware analysis report

Static analysis result for SHA-256 0614d1d59afb1b7e…

MALICIOUS

PDF

57.2 KB Created: 2020-08-08 18:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26b917e04ad37dfc2c82ba1fd81da83b SHA-1: 92bffdb77f4896f9136da1226cbbe12551dbd48f SHA-256: 0614d1d59afb1b7e69a0167ca7fa5bba9cc6226d3c6b7281ce3b807f094c267d
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 heavily obfuscated, contains URLs that are likely part of a link farm or SEO poisoning scheme, aiming to redirect users to malicious sites. No scripts were extracted, but the presence of malicious links is sufficient evidence of a 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=cantilever+beam+type+load+cell+pdf
    • http://files.sl-ltd.com/uploads/1/3/1/3/131398461/ba3737f7cf.pdf
    • http://tuwibul.mvhsphotography.com/uploads/1/3/1/8/131871721/pulizumerubamosifun.pdf
    • http://wabaxa.upgradedcomputers.com/uploads/1/3/0/7/130775432/rumugo-fowuzivozapij.pdf
    • http://files.bjeweledboutique.com/uploads/1/3/1/4/131409508/pepuliziw.pdf
    • http://files.cmmsmusic.net/uploads/1/3/2/6/132681882/8217858.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1434/9215/files/space_marines_codex_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/4093/9933/files/95630241044.pdf
    • https://cdn.shopify.com/s/files/1/0430/3365/7507/files/wiboba.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/datumaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9673/files/sedak.pdf
    • https://cdn.shopify.com/s/files/1/0432/3157/6231/files/manual_sql_server_management_studio_2020.pdf
    • https://cdn.shopify.com/s/files/1/0436/7450/1285/files/lewedamarominiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0417/files/mixozosafaniba.pdf
    • https://cdn.shopify.com/s/files/1/0432/8544/6822/files/61979722534.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/vutobelagod.pdf
    • https://cdn.shopify.com/s/files/1/0432/5376/0160/files/brewers_home_schedule_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/5226/9717/files/waxodezota.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_off00009586.bin
d8b907802410e675ceca2784509e58a9dae2947c1b2ad43e3e0c02687eabed47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9586 2952 bytes
font_01_sfnt_off0000a014.bin
ec99f54155f8acd29a310d3e53e3fa2ba95ffd9d15fbe7fe5804cb55be188264		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA014 5332 bytes
font_02_sfnt_off0000b22c.bin
d45e14814177e5315c493b0d3b8887576a75ff3c539bd7b8460fce8541cedc81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB22C 11000 bytes

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