Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1ac63ba81a14ef…

MALICIOUS

PDF

43.5 KB Created: 2020-08-07 05:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e55b6b2585261d7e5c82fe6f18e6c563 SHA-1: e1d78c713f85d13563f062170af233f4b86861aa SHA-256: 0a1ac63ba81a14ef6c55da348e6942ddfa706a3d373580a6075a0c274642c4bd
162 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically identified as a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=bankersadda+syllogism+pdf', which is also flagged by heuristics as a malicious redirector. The presence of a mass external PDF link farm further suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=bankersadda+syllogism+pdf
    • http://files.wordlyways.com/uploads/1/3/0/9/130968996/182983bdca2ace.pdf
    • http://files.waterproofingshopdrawings.com/uploads/1/3/0/8/130873944/vujatunadadar.pdf
    • http://varugapin.bustemupoutfitters.com/uploads/1/3/1/1/131163658/tajir-guxewufisotab.pdf
    • http://files.socalttc.net/uploads/1/3/1/0/131071252/9974945.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/7108/6485/files/zirabaxifobunazugozavu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5018/8443/files/10090325454.pdf
    • https://cdn.shopify.com/s/files/1/0434/8048/1958/files/87294887196.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3482/files/22951446517.pdf
    • https://cdn.shopify.com/s/files/1/0428/5336/7975/files/xazowawu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7473/9607/files/icy_veins_prot_pally.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/78937551522.pdf
    • https://cdn.shopify.com/s/files/1/0437/1188/9562/files/23460544520.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/31218090798.pdf
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/14397043751.pdf
    • https://cdn.shopify.com/s/files/1/0428/5192/6183/files/96043631613.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_off00005f3f.bin
529ddad8adc7ef50741f2a1eb91c3268de18b452e3276213c7283677dc68cd78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3F 5284 bytes
font_01_sfnt_off00007121.bin
bfb38dd7375f1aacae38f511a1ac1cf070bd172766041a0629ba42b0055d2fe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7121 9932 bytes
font_02_sfnt_off0000931c.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x931C 4324 bytes

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