Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cea4c63c6dd1770…

MALICIOUS

PDF

47.5 KB Created: 2020-07-31 08:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c16fe02810d2a314604ed279ba1b9d35 SHA-1: a08dfc7167d5356e5075f314d2b2e321fdfd4ca1 SHA-256: 6cea4c63c6dd1770c1e5b27a20d4aaea7755ea7f4d440bd015dfcb5baf457fba
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. It also exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious redirector links suggests an intent to lure users to harmful sites, likely 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.ru/pify?keyword=krishna+key+ashwin+sanghi+pdf
    • http://files.zacharyhoh.com/uploads/1/3/0/8/130873914/524900.pdf
    • http://files.kellieabernethy.com/uploads/1/3/1/3/131380600/korajev.pdf
    • http://files.addylucandles.com/uploads/1/3/1/3/131397940/64d49f4d2d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5586/6263/files/suzilasatekotigubi.pdf
    • https://cdn.shopify.com/s/files/1/0436/7410/8057/files/nodujutebixoxuxafivuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/4085/0598/files/lumefu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3853/0965/files/61573899534.pdf
    • https://cdn.shopify.com/s/files/1/0432/6621/2003/files/zabop.pdf
    • https://cdn.shopify.com/s/files/1/0431/1888/7073/files/kotemepotudoz.pdf
    • https://cdn.shopify.com/s/files/1/0438/4279/7730/files/73924430766.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/95815569900.pdf
    • https://cdn.shopify.com/s/files/1/0431/0056/9751/files/32007497836.pdf
    • https://cdn.shopify.com/s/files/1/0433/1775/6062/files/sakarepovubofuze.pdf
    • https://cdn.shopify.com/s/files/1/0431/6839/9524/files/59557804711.pdf
    • https://cdn.shopify.com/s/files/1/0434/6662/1094/files/14381807613.pdf
    • https://cdn.shopify.com/s/files/1/0432/0663/9779/files/24762539641.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_off00007ab9.bin
ea70783891139873d8c6064d30fae9201ddf252869c4ddd289a674c657e943e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB9 5096 bytes
font_01_sfnt_off00008c10.bin
1f04affc90fae185d244115928b9e59fdf5fe62d2e558f687fef4244a2a26e91
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C10 11108 bytes