Malicious PDF — malware analysis report

Static analysis result for SHA-256 a281d2ae93c92f5a…

MALICIOUS

PDF

47.7 KB Created: 2020-10-15 15:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 78558d079727e42f02dd96a0f3f2adbf SHA-1: 06d5d3d89fa3ffab43eebffb76a9f5f755507316 SHA-256: a281d2ae93c92f5a4a84f1d9311f53eac6e30b2829bff146a2bb318cb3aca624
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector URL known for malicious activity. The document body, though heavily obfuscated, contains the URL 'https://ggtraff.ru/123?keyword=corso+di+italiano+per+stranieri+libro+pdf', suggesting a lure to trick users into clicking on malicious links. 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://ggtraff.ru/123?keyword=corso+di+italiano+per+stranieri+libro+pdf In PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/nalamexu.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/1392291.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/safado-fodidunixoso.pdfIn PDF document text
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/sinoxas-nurus-juzizaga.pdfIn PDF document text
    • https://site-1041677.mozfiles.com/files/1041677/73371797058.pdfIn PDF document text
    • https://site-1038880.mozfiles.com/files/1038880/fujidibejidulokezonuweg.pdfIn PDF document text
    • https://site-1037082.mozfiles.com/files/1037082/luxifadulubinode.pdfIn PDF document text
    • https://site-1038338.mozfiles.com/files/1038338/65515757211.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2694/7989/files/bissell_proheat_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4494/1223/files/nirogemotu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/78252409314.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7594/3585/files/8_gallon_air_compressor_tank.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6557/2514/files/kaxuwirezovowidamulujazuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8513/5014/files/local_land_and_sea_breezes_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/2611/5481/files/twist_and_shout_mop_vs_ocedar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3686/8762/files/oracin_a_la_sangre_de_cristo_para_liberacin_proteccin_y_sellamiento.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/1384/8219/files/2845375295.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3097/7434/files/6.1_practice_a_geometry_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8640/8597/files/48584716822.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/3187/3704/files/what_are_the_factors_that_threaten_biodiversity.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B52 4988 bytes
SHA-256: afb70f2aded01859d15535d3446490df77882e86455f000c6e83be8be96514e5
font_01_sfnt_off00007c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C4B 11500 bytes
SHA-256: 732f6369753894afa252c3a830309e80480a09d857172161a722c3eabcaed56b
font_02_sfnt_off0000a164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA164 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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