Malicious PDF — malware analysis report

Static analysis result for SHA-256 75bf8169e7a7c1e6…

MALICIOUS

PDF

69.6 KB Created: 2020-09-09 01:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9abb017a57389f8d98f3b01ceb8d0f0 SHA-1: 857d75f064aa79194c5592801c06ba5b5867a794 SHA-256: 75bf8169e7a7c1e65b4c1b7beddd8e7788f32cd941b74045ccefaab5ea15dd54
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying a link to a known malicious redirector. The document body contains numerous embedded URLs, including the malicious redirector and many benign Shopify links, suggesting a link farm or SEO poisoning attempt. The primary malicious IOC is the redirector URL, which likely serves as a gateway to a phishing or malware distribution page.

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.me/pify?keyword=ggplot2+cheat+sheet+%25ED%2595%259C%25EA%25B8%2580
    • https://cdn.shopify.com/s/files/1/0430/3791/7345/files/63690630361.pdf
    • https://cdn.shopify.com/s/files/1/0469/9327/7080/files/polarized_3d_video_converter_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/4927/8875/files/exponential_equations_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/5967/5293/files/71715676770.pdf
    • https://cdn.shopify.com/s/files/1/0434/4158/6332/files/maminixujuguxosivos.pdf
    • https://cdn.shopify.com/s/files/1/0433/3391/0681/files/checkbox_group_html_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/9625/1304/files/59869993973.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6429/files/pinusatefasaluvogoni.pdf
    • https://cdn.shopify.com/s/files/1/0432/6732/6110/files/michelin_guide_london_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/0717/9941/files/53564059212.pdf
    • https://cdn.shopify.com/s/files/1/0434/8500/3926/files/meditations_marcus_aurelius_martin_hammond.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0507/files/88233158065.pdf
    • https://cdn.shopify.com/s/files/1/0431/3897/3857/files/bootstrap_3_glyphicons.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008c45.bin
d6685ccbf11bbef87ccd104728282b71d1eb43f8a411dfb86d5bdbff830f1743		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C45 5760 bytes
font_01_sfnt_off00009fd0.bin
f587f81d03834def8ce517990f4e95ddb56fe8b861b0a7656bc1454ae1336196		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FD0 3164 bytes
font_02_sfnt_off0000ab0e.bin
b2172c26dc50d732111ae5dcc2a7625e7cce248b6a412868ad64b26ed350d1c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB0E 5264 bytes
font_03_sfnt_off0000bcfb.bin
729bb224fdd9cfda45b903117f30afdb65dfc36ff87c3798d24444d5f6e66aa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFB 16664 bytes
font_04_sfnt_off0000f1b3.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B3 16204 bytes

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