Malicious PDF — malware analysis report

Static analysis result for SHA-256 71868393194a58b5…

MALICIOUS

PDF

44.1 KB Created: 2020-08-19 08:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d98e2bfbdd571511399c185edf9fc29c SHA-1: 483a86bff8477ee3eb63468596b992c323f8f68f SHA-256: 71868393194a58b57957175a4eab2a8cdd04651ddc028bf2a5f7659f3ce42cd9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text related to 'offshore fishing report' and a URL that is part of a link farm, suggesting a social engineering lure. The ML classifier also strongly indicated maliciousness.

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=offshore+fishing+report+san+diego
    • http://nixovudad.kinsellamitchell.com/uploads/1/3/1/4/131437513/7109614.pdf
    • http://pevudojev.kartchnersspecialtymeats.com/uploads/1/3/0/7/130739829/susotida-muvezozi-dipises.pdf
    • http://files.brandonmoorecomposition.com/uploads/1/3/1/4/131438766/muxigem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/3550/7358/files/82746655231.pdf
    • https://cdn.shopify.com/s/files/1/0431/5280/1943/files/autocad_2018_learning_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/2831/5288/files/gungeon_flash_ray.pdf
    • https://cdn.shopify.com/s/files/1/0433/0107/7142/files/57535341951.pdf
    • https://cdn.shopify.com/s/files/1/0434/0531/2154/files/jibagedu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0119/2352/files/muredobenelokux.pdf
    • https://cdn.shopify.com/s/files/1/0429/8647/1587/files/ielts_speaking_band_9_answers.pdf
    • https://cdn.shopify.com/s/files/1/0439/0433/6040/files/chicken_biryani_recipe_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0432/3436/1503/files/varufedotasejaragi.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ee6.bin
f3540d0e4b1b036aba3300c84da40c7fe4220db2d7d9ed89269767599e67c894
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE6 5088 bytes
font_01_sfnt_off00007021.bin
577d64cbf25183b45ab5200760d16becaf8ef95a910a51c946c1bde268bf2cbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7021 10828 bytes
font_02_sfnt_off0000950f.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x950F 4324 bytes