Malicious PDF — malware analysis report

Static analysis result for SHA-256 9256efbed000ce4b…

MALICIOUS

PDF

43.9 KB Created: 2020-08-09 00:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36a537713e733193938171269c3848d6 SHA-1: 718f4c609462c8b0d08e572a73808c23d412e5a0 SHA-256: 9256efbed000ce4bca9cbf4b52d3ca2f337693efed69e7981c7769984d57a289
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical redirector link to ttraff.com, indicating a link farm designed to lead users to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF. The document body, though heavily obfuscated, contains the same URL as the redirector link, suggesting the primary purpose is to drive traffic to malicious sites.

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=bed+making+procedure+pdf
    • http://files.cvintegrativetherapies.com/uploads/1/3/0/8/130814118/detewulug.pdf
    • http://rizoxuvu.scrippsnorthstar.com/uploads/1/3/1/0/131070374/punabaginulojig.pdf
    • http://kamoxe.pawsawaytravel.com/uploads/1/3/0/7/130739777/9631491.pdf
    • http://files.witneyhypnotherapy.co.uk/uploads/1/3/1/6/131636956/bidojulebetotisuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21096031872.pdf
    • https://cdn.shopify.com/s/files/1/0437/3318/8759/files/88660507357.pdf
    • https://cdn.shopify.com/s/files/1/0444/0604/6886/files/ge_advantium_120_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/4061/1226/files/69157254920.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wevola.pdf
    • https://cdn.shopify.com/s/files/1/0433/8991/1194/files/85953251484.pdf
    • https://cdn.shopify.com/s/files/1/0429/0487/9271/files/12209358316.pdf
    • https://cdn.shopify.com/s/files/1/0430/1602/8309/files/fifelem.pdf
    • https://cdn.shopify.com/s/files/1/0431/8468/5224/files/2134561132.pdf
    • https://cdn.shopify.com/s/files/1/0431/3264/9636/files/modafite.pdf
    • https://cdn.shopify.com/s/files/1/0432/6152/6166/files/meet_the_robinsons_little_wonders.pdf
    • https://cdn.shopify.com/s/files/1/0434/9627/6128/files/stephen_e_ambrose_band_of_brothers.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_off00006ecf.bin
3e8c8809ec109961ef48faebe5b856858ce8ba4517be0e5a2fbd34d17d7ed0c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ECF 5376 bytes
font_01_sfnt_off0000810e.bin
c15403763e315cd7790fcb9ed9d988268b19469c94e75cc11d1af6502f8e309a
pdf-font-stream PDF embedded font (sfnt) at offset 0x810E 9936 bytes