Malicious PDF — malware analysis report

Static analysis result for SHA-256 11abbaca81ab3c39…

MALICIOUS

PDF

45.7 KB Created: 2020-08-08 18:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 199a16dc4944954bf773c8b1d5092d71 SHA-1: dfb711797c4eabef4f4deffc0247cc61ad9b80c4 SHA-256: 11abbaca81ab3c39786485f9c251fbb0cd57570e570b16c73f96f6e3e85d2bbf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to 'contract costing formula pdf'. The presence of a link farm and a malicious redirector indicates an attempt to lead the user to a malicious site, likely for further exploitation or phishing.

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.cc/pify?keyword=contract+costing+formula+pdf
    • http://files.dbodigitalmarketing.com/uploads/1/3/2/3/132302780/52b41ba6580613.pdf
    • http://files.leading-causes.com/uploads/1/3/0/8/130813458/xafijumimugovo.pdf
    • http://files.woodsholevacation.com/uploads/1/3/2/6/132681698/gojepozijizabu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/talijofazejodo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2818/5239/files/tajizomumiwetu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8312/8214/files/currency_list_json.pdf
    • https://cdn.shopify.com/s/files/1/0438/3490/0637/files/81388589829.pdf
    • https://cdn.shopify.com/s/files/1/0436/7086/4025/files/95370603088.pdf
    • https://cdn.shopify.com/s/files/1/0428/2767/7852/files/tixerujedibawaju.pdf
    • https://cdn.shopify.com/s/files/1/0432/3105/1931/files/9464754963.pdf
    • https://cdn.shopify.com/s/files/1/0431/7108/6485/files/53145945427.pdf
    • https://cdn.shopify.com/s/files/1/0440/5483/9461/files/zetugejutuwunobolipukom.pdf
    • https://cdn.shopify.com/s/files/1/0429/8702/8641/files/matukixunabewiwume.pdf
    • https://cdn.shopify.com/s/files/1/0433/2303/1720/files/76610116215.pdf
    • https://cdn.shopify.com/s/files/1/0438/4073/3341/files/tejinedexonuvomiruzo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6379/5096/files/18493821762.pdf
    • https://cdn.shopify.com/s/files/1/0429/2552/3103/files/jilutonorumodojejidijef.pdf
    • https://cdn.shopify.com/s/files/1/0437/9394/0641/files/79523244858.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_off0000756d.bin
09bc6e019635374f247fac475ab5fe90446aa91e6a26f266de6c870ff20377be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x756D 5380 bytes
font_01_sfnt_off0000879e.bin
8be76982b82fb2cd9d9f82b8329e00ac96fd7559b3328718113071e808608612		 pdf-font-stream PDF embedded font (sfnt) at offset 0x879E 9888 bytes

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