Malicious PDF — malware analysis report

Static analysis result for SHA-256 628d3625375ebe8b…

MALICIOUS

PDF

36.6 KB Created: 2020-08-15 00:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76d8fb99b58af378e0b94733602e2d46 SHA-1: 98b28cccdb8453c226fb947905abc5714ee8fdb8 SHA-256: 628d3625375ebe8baca0ab181ada20ae5d7823116110fe789ee1509dd1c22add
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a download for 'Hiren boot cd 15. 2 iso file'. This link points to 'ttraff.cc', which is known malicious infrastructure. The document also contains a large number of links to other PDFs hosted on Shopify, likely for SEO manipulation or to obscure the malicious redirector. 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.cc/pify?keyword=hiren+boot+cd+15.+2+iso+file
    • http://files.bridgeandcivil.com/uploads/1/3/2/8/132815206/9934504.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/fasabebinili.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/95983619389.pdf
    • https://cdn.shopify.com/s/files/1/0438/2123/6386/files/jpg_to_online_converter_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/2541/3782/files/32452026855.pdf
    • https://cdn.shopify.com/s/files/1/0433/1605/2126/files/airlines_inform_ru.pdf
    • https://cdn.shopify.com/s/files/1/0430/6714/6397/files/kunotesexig.pdf
    • https://cdn.shopify.com/s/files/1/0429/1064/6435/files/kibuxafozaxon.pdf
    • https://cdn.shopify.com/s/files/1/0433/4275/8056/files/incoming_call_ringtone_free_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0434/7248/6564/files/studies_in_pessimism_schopenhauer.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_off0000521c.bin
dbf4b2e5ad9cd78b65bc8b11fe958c3e6e58b8444cc413a08c3edc14c55a76e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x521C 5244 bytes
font_01_sfnt_off0000640d.bin
cfa7f2199e6d478945f7472b32cd73fb175c5a8aa39530160478c855c0171ab6
pdf-font-stream PDF embedded font (sfnt) at offset 0x640D 10020 bytes