Malicious PDF — malware analysis report

Static analysis result for SHA-256 793afddc7983414b…

MALICIOUS

PDF

55.4 KB Created: 2020-08-31 07:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 577604a7c8afb5d4f73160bea296626f SHA-1: c1bd48d97aef87491e9c3a6da294f4727c171e7a SHA-256: 793afddc7983414bb4180f9e0581852d85804950a4a40ef6ac75d976906116cd
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, specifically `https://ttraff.cc/wix?keyword=brad+seely+49ers+salary`. This, combined with the heuristic `PDF_SEO_LINK_FARM` indicating a link farm, suggests a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded link and the PDF structure points towards an attempt to redirect users to malicious content.

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/wix?keyword=brad+seely+49ers+salary
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/314c35_a01b7ca4e8c547e08e54b9c09113fad9.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb081d87cd404d79988cd52e389d41e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_15e92f99d0184713afe8be59e0e5d453.pdf
    • https://static.usrfiles.com/ugd/97aff7_48dadfae91b3462fbca801e4074b09a8.pdf
    • https://static.usrfiles.com/ugd/a1fb72_46a75684f07945d2af07d4ccfcf7aa1a.pdf
    • https://cdn.shopify.com/s/files/1/0428/3616/4774/files/mkv_hindi_movies.pdf
    • https://cdn.shopify.com/s/files/1/0432/3006/8894/files/83186231461.pdf
    • https://cdn.shopify.com/s/files/1/0435/9792/2461/files/icao_annex_10_vol_1.pdf
    • https://cdn.shopify.com/s/files/1/0430/3503/3757/files/8183980163.pdf
    • https://static.usrfiles.com/ugd/f63f29_0a8182a1316a4944971a0b9426735683.pdf
    • https://static.usrfiles.com/ugd/87fdc7_69ca148e211549639962c8df1e3a1c47.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_off00009b6d.bin
babfdc2ade37d313cdf35fdb334c6e6e23535f2c778717b2b7a1aa0b0a111618
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B6D 5216 bytes
font_01_sfnt_off0000ad42.bin
cb6321af387d65fb82152240ba3818e2cdb6777eecc9ead75c031e58fe835de1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD42 10376 bytes