Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c85e3a7673bccd1…

MALICIOUS

PDF

49.3 KB Created: 2020-08-21 09:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34af5db56c695f7ce9fd37dd7100c240 SHA-1: ba4d60c6079a6c1e62b4889c67158d853d995879 SHA-256: 8c85e3a7673bccd169bd2040bf656c02920020c463cbd8b406b05f83350896d6
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The embedded URL 'https://ttraff.com/pify?keyword=season+greetings+business+email+template' is a key indicator of this redirection attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample, but the PDF structure itself is indicative of a phishing or redirection attack.

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=season+greetings+business+email+template
    • http://files.guyhang.com/uploads/1/3/1/4/131438539/8750354.pdf
    • https://cdn.shopify.com/s/files/1/0432/2433/4498/files/60444777225.pdf
    • https://cdn.shopify.com/s/files/1/0430/4705/9607/files/rezoxigekafuwujig.pdf
    • https://cdn.shopify.com/s/files/1/0431/6187/8687/files/66467397967.pdf
    • https://cdn.shopify.com/s/files/1/0434/4024/2840/files/87435949405.pdf
    • https://cdn.shopify.com/s/files/1/0428/1742/1479/files/fizoxirusofegowojumuwota.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9760/files/laxiguzajodofozexabekux.pdf
    • https://cdn.shopify.com/s/files/1/0427/8353/9366/files/bihar_electricity_board_admit_card.pdf
    • https://cdn.shopify.com/s/files/1/0431/0636/9703/files/how_to_make_a_paracord_bullwhip.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/sixigijixifebulifan.pdf
    • https://cdn.shopify.com/s/files/1/0432/5765/9547/files/79761853384.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d55.bin
d35ce805258d3645349e4e375f426fd8e9d1913d7072fdad553ecd9e669cd78c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D55 5384 bytes
font_01_sfnt_off00007f7d.bin
7c3cccca3978e69bdd5015f5a27955ee133498ca7681100ba6b6c65db9261a03
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7D 10128 bytes
font_02_sfnt_off0000a24e.bin
aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xA24E 16312 bytes