Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f30e1bbef7b75a…

MALICIOUS

PDF

40.2 KB Created: 2020-08-15 16:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10082e61a514cee415a04e11de27dc11 SHA-1: 41ead923eb117bd2add64b0f43dc6216f9abd8cb SHA-256: f6f30e1bbef7b75a4a9a4d54f19dbe2e72d847d75b0abc8052e7ec6b525bf191
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text related to the redirector's URL. The presence of a malicious redirector and a large number of external links suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery. The ML classifier strongly supports the malicious verdict.

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.com/wb?keyword=worry%20less%20pray%20more%20pdf
    • http://pimuwilik.authornicoleedwards.com/uploads/1/3/2/6/132681670/togelatefi.pdf
    • http://kesimuse.visaofoundation.org/uploads/1/3/1/4/131408854/gagotosobenigivadetu.pdf
    • http://files.halfgodtactical.com/uploads/1/3/0/7/130775102/c6457.pdf
    • http://legibu.marinetaverndawlish.com/uploads/1/3/0/7/130739654/1ee5b4.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/kirenuxifemaxurov.pdf
    • https://cdn.shopify.com/s/files/1/0433/6710/4668/files/83008150859.pdf
    • https://cdn.shopify.com/s/files/1/0434/5459/5224/files/69004410886.pdf
    • https://cdn.shopify.com/s/files/1/0431/7960/6177/files/afrikaans_dictionary_apkpure.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/allah_loves_me_book.pdf
    • https://cdn.shopify.com/s/files/1/0439/8658/3710/files/94861008734.pdf
    • https://cdn.shopify.com/s/files/1/0432/6719/5040/files/vopalubenukijol.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ef1.bin
36b609a31b90c97c1383a02b57be77fc843f2c37b2e790e2130d140526db0eb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF1 5300 bytes
font_01_sfnt_off000070fd.bin
9734110f279b6df3cf7fa9cbd2b4f56e6d78c3fcc261c97d881a0d85555a82f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70FD 10412 bytes

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