Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e5442e82da8dd9…

MALICIOUS

PDF

54.5 KB Created: 2020-08-26 06:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d99087502640af0bb9555ae8d40fd881 SHA-1: 520f481dbc494bbc9f8f5547681c9d11516dbe30 SHA-256: 37e5442e82da8dd9d27926080f81c30b16ee89bf8150f8d5abbcfe13e2711fe6
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to Shopify domains. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be luring the user to click the embedded malicious URL.

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=1.+explain+the+difference+between+absolute+advantage+and+comparative+advantage
    • http://zorowevul.smokeandfirecigars.com/uploads/1/3/1/4/131453134/342df8667630.pdf
    • http://files.vccburlington.org/uploads/1/3/0/8/130873906/zowaxaduzipevi_jafipebebigof_jamefijufu_zefonuvubonosi.pdf
    • http://deguvega.stjohnsepiscopalchurch.org/uploads/1/3/0/7/130776007/9359637.pdf
    • https://cdn.shopify.com/s/files/1/0437/2765/0970/files/ruxabazesifamurekoritosi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2309/6216/files/ap_stylebook_quiz_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/7807/4020/files/zajexerukexemij.pdf
    • https://cdn.shopify.com/s/files/1/0429/1448/0287/files/69378900634.pdf
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/tulomukedibewusuluvo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32829552166.pdf
    • https://cdn.shopify.com/s/files/1/0433/1867/3566/files/equidad_de_etnia_y_social.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/67710241177.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2680/files/84343733064.pdf
    • https://cdn.shopify.com/s/files/1/0448/2108/6365/files/mozabu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5952/8355/files/gisofo.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_off00009611.bin
c0b2b8dbedfa60ccfd784dd92976e54af3f3c9b62182052e7b0dde78da8e28a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x9611 5920 bytes
font_01_sfnt_off0000aa24.bin
8a273cc33877fd6f343647352bdf414b315ea9dff42ea9d566331b007439ead3
pdf-font-stream PDF embedded font (sfnt) at offset 0xAA24 10040 bytes