Malicious PDF — malware analysis report

Static analysis result for SHA-256 658ae2acfa5f6260…

MALICIOUS

PDF

50.6 KB Created: 2020-08-24 07:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba819d28ff26c283e6989c744a7c0cb3 SHA-1: 00af874fa6b80e1e71a3c3e724b481d206cb012b SHA-256: 658ae2acfa5f6260e0832a3d9e263aac42f0c633082a09ae45efc79084cf7434
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, ttraff.cc, which is designed to lead users to further malicious content. The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting a link farm used for SEO manipulation or to host a large number of malicious documents. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure strongly suggest an intent to redirect users to malicious sites, potentially for phishing or malware delivery.

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=asientos+contables+pdf+peru
    • http://files.dnofsinger.com/uploads/1/3/0/9/130969184/nogexa.pdf
    • http://files.hseforum.nyc/uploads/1/3/1/3/131383657/3430608.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8178/5753/files/26495158199.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/bobadam.pdf
    • https://cdn.shopify.com/s/files/1/0428/4035/9068/files/11667695112.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/93467974983.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86562581376.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12509012650.pdf
    • https://cdn.shopify.com/s/files/1/0433/1867/3566/files/36823365293.pdf
    • https://cdn.shopify.com/s/files/1/0432/0316/6372/files/xelubovafuxasek.pdf
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/62535829964.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6010/files/full_length_albums_free_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/8729/7696/files/velujijezugefitimixolu.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007393.bin
451d0eaa8ff332b835fcfa7dc0290c5f08cb5537636ea8e8bfb500fd60e6ceb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7393 5276 bytes
font_01_sfnt_off00008587.bin
a526253e618e62b23292b2225ec1b16aa804ca1be4cb509a1a2e405d8e9bc8f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8587 10200 bytes
font_02_sfnt_off0000a872.bin
64f21e55c2f29c6f605e8f9fd96e7f7b34f9b4a26fdc717ddead948457370e3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA872 16148 bytes

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