Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1fc97ecbcd7eaff…

MALICIOUS

PDF

36.1 KB Created: 2020-08-02 13:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ac0a4618708e91c7b5233780e3b083b SHA-1: 3099008e1aa9c0e2b2fc23b7c9d271440a70a918 SHA-256: e1fc97ecbcd7eaffcc0037ed161a1746623d36e18347c4901be157504a7ce1b7
154 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, embedding a large number of external links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=shurflo+4008-+101-+a65. While no scripts were extracted, the sheer volume of links and the identified malicious redirector strongly suggest an intent to lure users to malicious sites. The ML classifier also flagged this PDF with high confidence.

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.ru/pify?keyword=shurflo+4008-+101-+a65
    • http://files.airbnbcleaningserviceanchorage.com/uploads/1/3/0/7/130739081/868753.pdf
    • http://files.betsynorris.com/uploads/1/3/1/3/131398091/e96a329d.pdf
    • http://files.westscotlandrce.co.uk/uploads/1/3/2/6/132681207/7599490.pdf
    • http://files.thehealthyroot.com/uploads/1/3/1/0/131070452/totopumawi_volulezuzu_bezowago_kolitozuxewab.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/88175876059.pdf
    • https://cdn.shopify.com/s/files/1/0435/6636/6869/files/dalof.pdf
    • https://cdn.shopify.com/s/files/1/0434/4909/0200/files/succubus_south_park.pdf
    • https://cdn.shopify.com/s/files/1/0427/6604/1244/files/4220763386.pdf
    • https://cdn.shopify.com/s/files/1/0437/1608/3877/files/622726736.pdf
    • https://cdn.shopify.com/s/files/1/0432/4350/3783/files/84533891497.pdf
    • https://cdn.shopify.com/s/files/1/0434/9906/1408/files/acer_aspire_boot_menu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87745409623.pdf
    • https://cdn.shopify.com/s/files/1/0429/1638/0831/files/49432825658.pdf
    • https://cdn.shopify.com/s/files/1/0429/6677/8009/files/mutijirewipukiseruka.pdf
    • https://cdn.shopify.com/s/files/1/0429/8942/0695/files/pagubaropomapopozigegenup.pdf
    • https://cdn.shopify.com/s/files/1/0437/2204/7638/files/kubota_b7800_specs.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_off00004e28.bin
b916d7ecca06e81bfe7c649d1e63cfafb36c765da1bffa9782b324de958bae67
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E28 5568 bytes
font_01_sfnt_off00006122.bin
7867146ba231d4b92a76b8ff8e05ab3a30a75a2c6889c6d8f8d3ac2e9f4c2315
pdf-font-stream PDF embedded font (sfnt) at offset 0x6122 10140 bytes