Malicious PDF — malware analysis report

Static analysis result for SHA-256 39031b1e67ec36d9…

MALICIOUS

PDF

36.8 KB Created: 2020-08-14 23:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e44b825211deb5a8ae0317059ad28fa6 SHA-1: 70e82d00c6e969c060e6607df7ab948edf8c6bef SHA-256: 39031b1e67ec36d93e5fca3186abe2a18ae526876a9c7ad3120c864828e0a68d
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains text related to a game and the malicious URL, suggesting a lure to download potentially malicious content. The ML classifier strongly flagged this PDF as malicious.

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=barbie+dreamhouse+adventure+game++apk
    • http://pijezed.altmeds.org/uploads/1/3/0/9/130969335/c9bc93c4b98.pdf
    • http://files.communityofcharacter.ca/uploads/1/3/0/9/130969389/tofom.pdf
    • http://files.tylertutor.com/uploads/1/3/1/0/131069899/rizenunusanexufos.pdf
    • http://files.homewellconstruction.com/uploads/1/3/0/7/130740249/lobozumi.pdf
    • http://bimowi.crossroadswsks.com/uploads/1/3/1/3/131384635/deketonoreduri.pdf
    • https://cdn.shopify.com/s/files/1/0429/8738/9087/files/17381654590.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23535065851.pdf
    • https://cdn.shopify.com/s/files/1/0439/6145/0654/files/pdf_file_format_specification.pdf
    • https://cdn.shopify.com/s/files/1/0429/8801/1673/files/58693898661.pdf
    • https://cdn.shopify.com/s/files/1/0431/2635/8173/files/45599287978.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/filter_arrayadapter_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/4796/8149/files/gagapomidud.pdf
    • https://cdn.shopify.com/s/files/1/0443/3425/2188/files/wokuzivanetesamoxe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19252536586.pdf
    • https://cdn.shopify.com/s/files/1/0429/0173/3542/files/jabejiverurubipabewexiduf.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_off00004e34.bin
304bed8719bd74c5aece7e23c3a42a179d72e648bb47dacba040af4ae23447a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E34 5652 bytes
font_01_sfnt_off00006152.bin
10b8573258f17fc7a2d8d06e9adcc031c7ad342f55ee4c053071a5eb58e90160
pdf-font-stream PDF embedded font (sfnt) at offset 0x6152 10800 bytes