Malicious PDF — malware analysis report

Static analysis result for SHA-256 825fc5acd14dd4af…

MALICIOUS

PDF

42.4 KB Created: 2020-09-10 05:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22b4670b8b46fd56c62d4619f0c02b16 SHA-1: 38676e0bd494b74383433b98748d72738955bfa0 SHA-256: 825fc5acd14dd4afbe9cc393b9e8ac6a1098be7d95aa52bbc2bdb62d09b503d5
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a critical heuristic firing indicating a malicious redirector link. Another critical heuristic identifies a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly flagged this PDF as malicious. The embedded content appears to be largely obfuscated, but the presence of the URL 'https://ttraff.link/wix?keyword=cleveland+browns+bleacher+report+home' and other similar PDF hosting links indicates a likely phishing or malware distribution vector.

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.link/wix?keyword=cleveland+browns+bleacher+report+home
    • http://xidixig.sarahjebian.com/uploads/1/3/1/4/131453574/df267fe348.pdf
    • http://files.sujordan.com/uploads/1/3/1/4/131406749/gawigu_nisinuvuke_vijim.pdf
    • http://files.hankandmurphy.com/uploads/1/3/2/6/132695416/8a63adc4b4da7c.pdf
    • http://noxesowom.lcalvioartwork.com/uploads/1/3/2/3/132303035/kawisidufaziwenizojo.pdf
    • https://static.usrfiles.com/ugd/0df15e_2b26e212db464a2c8033e88140ac9ff2.pdf
    • https://static.usrfiles.com/ugd/fef806_e67d9b9e95f6467e92cbb9509345c6ec.pdf
    • https://static.usrfiles.com/ugd/113e89_dc0c068f6cef4f0a9a657ae18c36516d.pdf
    • https://static.usrfiles.com/ugd/b52961_9f3758013a914e5595d923b71ea35d35.pdf
    • https://static.usrfiles.com/ugd/77d535_16c3de575f824275a862c513ebefa501.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/natelufenamatiwetatudo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2868/3672/files/calendar_apps_for_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16485275060.pdf
    • https://cdn.shopify.com/s/files/1/0431/8871/5682/files/32477080177.pdf
    • https://cdn.shopify.com/s/files/1/0435/9208/9759/files/lomikupobaxak.pdf
    • https://cdn.shopify.com/s/files/1/0437/1765/6731/files/xepapinizarumomate.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_off000065ea.bin
030fb866ed467c88de619e9b3df5a5da7a490a3b282ed1e4d36c07f24fe146c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x65EA 5508 bytes
font_01_sfnt_off00007887.bin
e5dd6d2aaee66679a7b5756f5db207f9ec2acd3e230d6198532571f1f8378fc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7887 10596 bytes