Malicious PDF — malware analysis report

Static analysis result for SHA-256 870b778086c297fb…

MALICIOUS

PDF

41.3 KB Created: 2020-09-01 03:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3233a31c5bc5526cf8f84533b4cd37c SHA-1: acb3ac553b6b791e9ff8febda301fd3e1e384a64 SHA-256: 870b778086c297fb21769c036533f2866e7c91920f751c8fddcce7dfedc8237b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/pify?keyword=advanced+ip+scanner++windows+7+filehippo'. This URL is likely used to redirect users to a malicious site, potentially for phishing or malware delivery. The document also contains a large number of external PDF links, many hosted on Shopify, which is indicative of a link farm used for SEO manipulation or to obscure malicious destinations. The ML classifier also strongly flagged this PDF as malicious.

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.club/pify?keyword=advanced+ip+scanner++windows+7+filehippo
    • https://cdn.shopify.com/s/files/1/0432/1515/9458/files/time_inception_music_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0440/4533/6726/files/fufaxubakawugimabo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1520/files/17233372602.pdf
    • https://cdn.shopify.com/s/files/1/0427/8878/2236/files/jowereruwedugenatev.pdf
    • https://cdn.shopify.com/s/files/1/0434/4984/3868/files/mathematical_thinking_d_angelo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7621/files/coffee_day_enterprises_limited_annual_report_2019.pdf
    • https://cdn.shopify.com/s/files/1/0431/4746/0768/files/11989209681.pdf
    • https://cdn.shopify.com/s/files/1/0433/2421/1354/files/6518728435.pdf
    • https://cdn.shopify.com/s/files/1/0436/9501/4056/files/33794503608.pdf
    • https://cdn.shopify.com/s/files/1/0439/4080/6824/files/xomisonenagekanozedot.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_off00006347.bin
c4f2e8f4a8fe78e589e6afcdc47e19956b38c50bc907ffef6cd056916fac26d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6347 5464 bytes
font_01_sfnt_off000075f1.bin
b8a75ca3db3af5cc443496105a367787acc49f842e41dd62db81451127a9bd28
pdf-font-stream PDF embedded font (sfnt) at offset 0x75F1 10068 bytes