Malicious PDF — malware analysis report

Static analysis result for SHA-256 b518c578a81d8163…

MALICIOUS

PDF

114.7 KB Created: 2020-08-07 07:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13492851839e4452009150d5e9abb7ee SHA-1: c0e86d11765e9472637194779941051602b6739e SHA-256: b518c578a81d8163fdbc191ecaf81d336cda6ac8e2dbf57ea6053576c9610077
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=rigveda+samhita+in+sanskrit+pdf'. This URL is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, also contains this URL, reinforcing its role as a lure. The ML classifier also 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.ru/pify?keyword=rigveda+samhita+in+sanskrit+pdf
    • http://files.monroecountykychamber.com/uploads/1/3/0/8/130814124/pegumeviko_lovijovotugus.pdf
    • http://files.lesothocsa.com/uploads/1/3/0/9/130969352/kajemofaketonoxoroju.pdf
    • http://files.deansvillehorseshoeclub.com/uploads/1/3/2/6/132681212/4519249.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/78199124295.pdf
    • https://cdn.shopify.com/s/files/1/0433/8860/0478/files/mojadavezepekaxamolamojag.pdf
    • https://cdn.shopify.com/s/files/1/0450/7333/4424/files/bash_shell_scripting_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0436/0008/5149/files/netobizapefulogojaxu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9993/8211/files/gasikedigi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5300/6494/files/unlocking_android_a_developer_s_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/6499/9590/files/fujuwevik.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/wodinudatoleb.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6787/files/95132001692.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3549/files/feredivebalakivesop.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/american_english_file_3_teacher_s_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/action_words_pictures.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_off000176f5.bin
7b60ba311bcb700b147ee68c8c5cac91af6914a33abaca717d5a787566086996		 pdf-font-stream PDF embedded font (sfnt) at offset 0x176F5 5552 bytes
font_01_sfnt_off000189bc.bin
d9b5eb47c3cd1219bfdcf30f9d7f114eb6d782f3aab23a377303899c1e592ce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x189BC 11764 bytes
font_02_sfnt_off0001af75.bin
0affff6a929d210e1cac4e96d54ac44f58c141ae4a8ac338baff4d4bb52d81eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF75 3564 bytes

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