Malicious PDF — malware analysis report

Static analysis result for SHA-256 0113e1b408d5e6e8…

MALICIOUS

PDF

37.1 KB Created: 2020-08-30 08:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ce7d8f338e3c8a449488f8f2a180c62 SHA-1: 3e829d6b0c1782817f251d97bc8417cf2761d694 SHA-256: 0113e1b408d5e6e805bdf2c8907225fe494915a0536e7c1b72fcb3fa19dbe57a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=importing+pdf+into+publisher'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links. The ML classifier also strongly flagged this PDF as malicious. The embedded document body text, though partially corrupted, contains the same redirect URL and a reference to 'importing pdf into publisher', suggesting a lure.

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=importing+pdf+into+publisher
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_e0f40f6d51cd4ed3a4cd5aecdc74f11a.pdf
    • https://static.usrfiles.com/ugd/2f8cea_ad94535a234547f892da76b9be618acf.pdf
    • https://static.usrfiles.com/ugd/1be480_909c321632584fb0bd9ce36a93dcc0f3.pdf
    • https://static.usrfiles.com/ugd/1b8612_4bf2b20b4d174396bf356fe4be796c76.pdf
    • https://static.usrfiles.com/ugd/7baf93_9e7b6ea08279451b97dd7f0f3022ee64.pdf
    • https://static.usrfiles.com/ugd/c345b0_7782693c69684e30a0d596d365dd45ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_5cb0cda1480f47419fa40babc8d9a77b.pdf
    • https://static.usrfiles.com/ugd/40512e_d028ff7f645041528ce072739d6024a2.pdf
    • https://static.usrfiles.com/ugd/eda9ba_16c18be0ed4049799aa0c0ba20d8c128.pdf
    • https://static.usrfiles.com/ugd/33ab24_078bfffdf08a458db037a113cb02f1f3.pdf
    • https://cdn.shopify.com/s/files/1/0470/9299/0110/files/free_event_photography_contract.pdf
    • https://cdn.shopify.com/s/files/1/0430/9549/0721/files/71158484227.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_off000052bc.bin
ddcccac13af8d505b9216b560cb9ad52efa0fc54e73093479d1a06bf0a7681e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x52BC 5324 bytes
font_01_sfnt_off000064a0.bin
c1b24c570884d927263e5da72af78720d70614815d3ea5f5c3c1cf0a2d871977
pdf-font-stream PDF embedded font (sfnt) at offset 0x64A0 10396 bytes