Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f74be5d2091c728…

MALICIOUS

PDF

71.8 KB Created: 2020-08-06 21:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32af1dd54f675e44b07303b955c879f2 SHA-1: 6f862250c0dddad982bcb1529627cd70dabf1c12 SHA-256: 7f74be5d2091c728932286ab95ac6da27ac01ac1e4c9742ad275bbbcd12241f6
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, many hosted on cdn.shopify.com, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier strongly flagged this PDF as malicious. The presence of the malicious redirector URL and the link farm points to a likely distribution or redirection scheme.

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.com/pify?keyword=amidah+en+espa%25C3%25B1ol+pdf
    • http://files.sthrouda.com/uploads/1/3/1/4/131408142/6522907.pdf
    • http://files.lifepointeroanoke.com/uploads/1/3/0/7/130738666/kivorepiso_tumomemaku.pdf
    • http://files.firstbaptistwhiteplains.org/uploads/1/3/1/6/131606569/zekosinut.pdf
    • http://files.visceral-entertainment.com/uploads/1/3/1/6/131606127/lafizuf.pdf
    • http://files.humboldtmutualinsurance.com/uploads/1/3/0/7/130739864/letowaron.pdf
    • https://cdn.shopify.com/s/files/1/0438/1723/8685/files/callable_vs_runnable.pdf
    • https://cdn.shopify.com/s/files/1/0433/8217/7946/files/57083537465.pdf
    • https://cdn.shopify.com/s/files/1/0434/8854/2872/files/pofijumam.pdf
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/35310573785.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/36543570336.pdf
    • https://cdn.shopify.com/s/files/1/0435/6567/8755/files/bailey_scott_s_diagnostic_microbiology_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/9088/6299/files/53277488466.pdf
    • https://cdn.shopify.com/s/files/1/0433/8129/3221/files/89594754562.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/bmw_s1000rr_2020_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/spider_man_comic.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6157/files/fibadunumefiluvuxon.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_off0000d334.bin
c37fd3c95222cb237ab7494e2ba17d02935d24c9d846f1c246640843dc1ff373
pdf-font-stream PDF embedded font (sfnt) at offset 0xD334 5384 bytes
font_01_sfnt_off0000e51f.bin
042bc6ed5cbd35e351fffedde65bf2e879950e5aebfbee25ce532c1dbd02fbf8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 13536 bytes