Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d3f7ff812a0a88…

MALICIOUS

PDF

53.4 KB Created: 2020-08-11 01:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2fa85b56dfb420c7b75822898b2d870 SHA-1: 4794cc52b4b35ea75e0e42feb910baf4b694bebc SHA-256: a7d3f7ff812a0a8817120d9ea2fdd2eef79822749f92fcbe5600addb3e22f646
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external resources, which is characteristic of a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/wb?keyword=identidades%20trigonometricas%20hiperbolicas%20pdf'. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated but contains references to the redirector URL and other Shopify-hosted PDF files.

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=identidades%20trigonometricas%20hiperbolicas%20pdf
    • http://files.drjuliewilkening.com/uploads/1/3/0/8/130873893/xodonugasebi.pdf
    • http://files.servastaiwan.org/uploads/1/3/1/3/131398333/walivupipevawi_xejinopeguvuni.pdf
    • http://files.rashidacostaauthor.com/uploads/1/3/1/4/131437380/nagasimu-nodumotixotob.pdf
    • http://lomefujuj.executiveshuttlebuslimo.com/uploads/1/3/2/8/132816066/6073044.pdf
    • http://files.inhiminc.org/uploads/1/3/2/6/132696104/sazesivefopumebetuwu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9573/6988/files/40769170320.pdf
    • https://cdn.shopify.com/s/files/1/0432/2076/2783/files/journey_aaron_becker_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/1014/6983/files/bebifumedapilejedesuvag.pdf
    • https://cdn.shopify.com/s/files/1/0431/3976/0295/files/emacs_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/4659/8821/files/asturias_guitarra.pdf
    • https://cdn.shopify.com/s/files/1/0439/5089/9368/files/hipertrofia_de_adenoides_en_nios.pdf
    • https://cdn.shopify.com/s/files/1/0427/4742/9031/files/play_prodigy_game.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/exercice_algorithme_tableau_corrig.pdf
    • https://cdn.shopify.com/s/files/1/0427/4189/1238/files/zorua_ultra_sun.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/industrial_centrifugal_blower.pdf
    • https://cdn.shopify.com/s/files/1/0435/2524/3039/files/11325900156.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/91036659400.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_off00006cf7.bin
155634820ff65840727c441b5b6bba46d236544811c1e98e76b3dbbc96222054		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF7 5648 bytes
font_01_sfnt_off00007ff2.bin
68b072adf6c1f9c1a641cea8a7bd6521da98065371ac9e0c673a463e64380b69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF2 15844 bytes
font_02_sfnt_off0000b197.bin
f60772b6869086652a040dee328c3d1f18c5591217e92cd57bc35e79e491fd65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB197 16120 bytes

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