Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dac1907065df1e9…

MALICIOUS

PDF

41.0 KB Created: 2020-08-10 16:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5c85ccd7432255671f85ab629142dda SHA-1: 352c29eddd6da1ba34979128f32d57b26cf37001 SHA-256: 8dac1907065df1e97414cbabea6f02a14be07b626358b06a4e798368ce06c9b4
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a high likelihood of malicious intent, possibly for SEO poisoning or redirecting users to phishing or malware distribution sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of links suggests a coordinated effort to distribute malicious content or manipulate search results.

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=todo+sobre+el+cordon+umbilical+pdf
    • http://files.ajaxaspenproperties.com/uploads/1/3/0/7/130740378/1510251.pdf
    • http://files.thecuteheifer.com/uploads/1/3/1/6/131606431/ketitujadeze.pdf
    • http://files.theilounge.net/uploads/1/3/0/9/130969056/palikovu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2748/8168/files/bedutazuwame.pdf
    • https://cdn.shopify.com/s/files/1/0430/2353/2195/files/google_maps_ajax.pdf
    • https://cdn.shopify.com/s/files/1/0439/1328/1688/files/99896643501.pdf
    • https://cdn.shopify.com/s/files/1/0433/9567/8359/files/74843990488.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8573/files/43329103336.pdf
    • https://cdn.shopify.com/s/files/1/0437/2630/7480/files/8450887692.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/25832798452.pdf
    • https://cdn.shopify.com/s/files/1/0437/3777/6289/files/pdf_annotator_free_linux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/61286624564.pdf
    • https://cdn.shopify.com/s/files/1/0435/5837/1496/files/gabagujetinifelu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4902/5690/files/marvel_deadpool_comics_free_download.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_off00005fc4.bin
0ec60d73ab93a05eee6983e1b1e3736b86917e2d169da46f33c0e3acaafb76fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC4 5392 bytes
font_01_sfnt_off000071f9.bin
c9c1a8f02e7286455ad6e188a687315bb5f9b08b78944908b7095efa9a9b43d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x71F9 11056 bytes