Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de5254b0af56602…

MALICIOUS

PDF

43.0 KB Created: 2020-08-29 21:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7df14e47d655613f1b836bf417ff7e9 SHA-1: dd3c3519a28bc8a20aebb29a0835e1449aa3b770 SHA-256: 9de5254b0af56602cba371cfeea0bbac70e855ba936a338e64d6c7d496814595
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector infrastructure at 'ttraff.ru'. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic, potentially to obscure the malicious redirector.

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/wix?keyword=formatges+artesans+cal+verdaguer
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/xaxavezevuduzibazis.pdf
    • https://cdn.shopify.com/s/files/1/0431/2511/2988/files/chemistry_handwritten_notes_for_ssc_cgl.pdf
    • https://cdn.shopify.com/s/files/1/0435/2534/1343/files/bsc_1st_year_maths_syllabus_2018.pdf
    • https://cdn.shopify.com/s/files/1/0432/9180/3801/files/upprpb_answer_key_download_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/9358/0189/files/71788046803.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/voxetevew.pdf
    • https://cdn.shopify.com/s/files/1/0433/9207/3895/files/winifosufunul.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4047/files/gadorotom.pdf
    • https://cdn.shopify.com/s/files/1/0447/4558/8887/files/glossary_of_financial_accounting.pdf
    • https://cdn.shopify.com/s/files/1/0438/4882/7040/files/dra_blackline_masters_4-8.pdf
    • https://cdn.shopify.com/s/files/1/0454/2434/5244/files/tuzigafopojemaresewam.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/97166559231.pdf
    • https://cdn.shopify.com/s/files/1/0430/8143/3242/files/live_server_npm.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_off00005913.bin
714514698a21113cd2590035a6679067aa493a3fcd4196277f31b09370d63d0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5913 5108 bytes
font_01_sfnt_off00006a5c.bin
51b7c2d6f0ed17456ece603287146a3ab05e8f4a36e10f26e998b8d45cc609ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A5C 11700 bytes
font_02_sfnt_off00008f94.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F94 4324 bytes