Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd18c573b2a038c…

MALICIOUS

PDF

42.0 KB Created: 2020-08-20 12:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35d29426facaaeb7e09fcc54cbee2ab6 SHA-1: c601d513408ffd9205f22f1847ca80aa6d8d6f9a SHA-256: ecd18c573b2a038c8d0f3a71c90387dbbee60419b3d5875508549ae82b12cefc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous external PDF links, many hosted on Shopify, and a primary redirector link to 'ttraff.cc'. The ML classifier strongly flagged this PDF as malicious. The document body, though obfuscated, contains the text 'Houston tx zip code map pdf' and the malicious URL, suggesting a lure to trick users into clicking malicious links.

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/pify?keyword=houston+tx+zip+code+map+pdf
    • http://mubur.george-ohagan.com/uploads/1/3/1/0/131069934/daveduzupemedowev.pdf
    • http://litenu.cranechuanfa.com/uploads/1/3/1/4/131409236/3798648.pdf
    • http://files.envsalongrantspass.com/uploads/1/3/0/7/130739126/joxakofalumap.pdf
    • http://japegawim.michaeljohnfierro.com/uploads/1/3/2/8/132815176/lotigajun-bizami-lapemuguzukosi.pdf
    • http://files.adventurescenictoursofcolorado.com/uploads/1/3/1/3/131381612/8756166.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/vehicle_inspection_form_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/1615/1455/files/xaxab.pdf
    • https://cdn.shopify.com/s/files/1/0429/2896/3747/files/5286080841.pdf
    • https://cdn.shopify.com/s/files/1/0435/5201/4491/files/calculus_problems_and_solutions_ginzburg.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9535/files/divinity_original_sin_enhanced_crafting_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/5608/7708/files/52783310620.pdf
    • https://cdn.shopify.com/s/files/1/0437/9174/5175/files/wotubabuwaximujegom.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062b1.bin
dbdf899029436362e0e541d392356a5b2e5cc65b80f6d5df32dcf16ebbb5e640
pdf-font-stream PDF embedded font (sfnt) at offset 0x62B1 5252 bytes
font_01_sfnt_off00007486.bin
8dd2e2924dbdd25012921e9c0a919a8fcf919d421864a659a05b44646b3eae3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7486 12348 bytes