Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea546be81ffb6ed…

MALICIOUS

PDF

42.1 KB Created: 2020-08-06 17:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c74048b72cfc325fa45740da48e6cc79 SHA-1: a552658b2059956b15ab54d9492147607f3ae7d3 SHA-256: 1ea546be81ffb6ed73e8783f33554dbbb3ca99d96a38ed224a2e910b892137ed
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/wb?keyword=battery%20tender%20800%20manual'. Another critical heuristic identified a PDF link farm, suggesting a broad distribution effort. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing the lure.

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/wb?keyword=battery%20tender%20800%20manual
    • http://files.vanessasvihla.org/uploads/1/3/2/7/132710780/fibigetobibojag.pdf
    • http://files.worldchurchofmessiahusa.org/uploads/1/3/1/1/131164273/neragefiwamunozufis.pdf
    • http://files.lemonsipper.com/uploads/1/3/1/4/131407057/3385769.pdf
    • https://cdn.shopify.com/s/files/1/0434/1560/1319/files/54663928961.pdf
    • https://cdn.shopify.com/s/files/1/0432/3095/3630/files/php_case_statement.pdf
    • https://cdn.shopify.com/s/files/1/0435/4090/6135/files/rstudio_standard_deviation.pdf
    • https://cdn.shopify.com/s/files/1/0433/8437/3409/files/amar_chitra_katha_collection.pdf
    • https://cdn.shopify.com/s/files/1/0435/5158/8507/files/24296391065.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vunumegosuvuvorewufo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7938/5756/files/binary_to_decimal_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0430/5905/2706/files/34388241562.pdf
    • https://cdn.shopify.com/s/files/1/0431/8668/4068/files/9668022972.pdf
    • https://cdn.shopify.com/s/files/1/0429/6281/3084/files/bunigoritoxaboxasulopu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/zapuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/4184/8470/files/32294975359.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_off000064e1.bin
562f7447f689229beb89b8bd1f3ddec19c793bce9e3c12645abcb0e5707de99d
pdf-font-stream PDF embedded font (sfnt) at offset 0x64E1 5280 bytes
font_01_sfnt_off000076c3.bin
2fb171e44812eceefbf808b8473d0fb39a233d916408ba5ff03353561cafb59a
pdf-font-stream PDF embedded font (sfnt) at offset 0x76C3 10472 bytes