Malicious PDF — malware analysis report

Static analysis result for SHA-256 08504d98c4412c62…

MALICIOUS

PDF

44.5 KB Created: 2020-08-10 10:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 791a65f82d0282057b6d368cba1ea6ff SHA-1: fe5f26f115ae1a93e6e7265e1c6780d734a38cb0 SHA-256: 08504d98c4412c62cdc488ae09216f3b7ba475d25a8be969e343d33b59690211
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=local+anesthesia+pdf'. The document body, though heavily obfuscated, contains this same URL, indicating the primary intent is to redirect users to malicious content. No scripts were extracted from this sample.

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=local+anesthesia+pdf
    • http://kusomit.thoughtfulhorsemanship.net/uploads/1/3/1/4/131482995/9e1859dca112.pdf
    • http://files.grassriver.org/uploads/1/3/2/7/132740270/buwegegobevakagulido.pdf
    • http://files.1944becker.com/uploads/1/3/2/6/132680808/vuvamosokesazajiva.pdf
    • http://files.metersnelectronics.com/uploads/1/3/1/0/131070920/koritumifuligowep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7920/5013/files/nugimimarolidebirufev.pdf
    • https://cdn.shopify.com/s/files/1/0429/8178/5753/files/5675969577.pdf
    • https://cdn.shopify.com/s/files/1/0432/6375/4404/files/85338384443.pdf
    • https://cdn.shopify.com/s/files/1/0431/7315/0869/files/netstumbler_adapter_not_present.pdf
    • https://cdn.shopify.com/s/files/1/0436/9501/4056/files/strategic_brand_management_keller_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/9359/0170/files/55762272318.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xizujebekox.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2891/files/33545346938.pdf
    • https://cdn.shopify.com/s/files/1/0433/1791/9909/files/2015_honda_rebel.pdf
    • https://cdn.shopify.com/s/files/1/0428/5258/1542/files/strip_whitespace_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0430/5797/1362/files/55795117465.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81579197248.pdf
    • https://cdn.shopify.com/s/files/1/0434/8549/5453/files/74751368466.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fuwemosuwizukuxitakalav.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_off0000711f.bin
c3d8e5c02631b947c7d2f410a7bd8576c701ab489de6feb47c8e2ccb66316ff2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x711F 5088 bytes
font_01_sfnt_off00008275.bin
1c5b863dca03c82e9bf4280ddd8a42e84729166ee0d884e51db42bc7f6a17a24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8275 10224 bytes

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