Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3bab7fd20599c3e…

MALICIOUS

PDF

44.6 KB Created: 2020-10-14 17:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5f6ccb571203bd9cbbdcdc5581979bef SHA-1: 27735b93f5b1cf1536b71a223cc894d5a6b7ee8c SHA-256: a3bab7fd20599c3e09e7f91b1fdafb050ee4a763395948282ddc20dd9141e045
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'golf card game instructions' and includes the malicious URL, suggesting a lure to trick users into visiting potentially harmful sites. 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://gettraff.ru/pify?keyword=golf+card+game+instructions In PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/jasamejug-jenutuzudemeluf.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/tebavu_mofevuz_punoxibera_gijipomole.pdfIn PDF document text
    • https://site-1036625.mozfiles.com/files/1036625/9086177451.pdfIn PDF document text
    • https://site-1041483.mozfiles.com/files/1041483/vizevaxuzefebevosapubetak.pdfIn PDF document text
    • https://site-1043286.mozfiles.com/files/1043286/bosam.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/mukobuf.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/lixavej_rivutavipulox_vunezikavad_lirumonoguwako.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/pokobu-pidoror-pekirez.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/6431815.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2636/6116/files/velenu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4909/3797/files/zenovuvenagedufitonavumuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5757/0207/files/new_scofield_reference_bible_1967_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3144/4128/files/letter_from_birmingham_jail_selection_quiz_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5738/8437/files/viwawimubafimezaro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5311/6320/files/heart_of_worship_chords_ukulele.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/5912/6684/files/applied_calculus_hughes_hallett_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27e7cc24-edac-4b41-bf39-cc45d9aa61e5/bewepagapajuxid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7971b0e-315d-4553-b6cb-5223ba7ec3b5/59563919365.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70A3 5372 bytes
SHA-256: d5736798fc270a5ee5e4a38bd5b943670138baff1bbe174889db49db29e0ae2e
font_01_sfnt_off000082cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82CF 10156 bytes
SHA-256: bde79d4d019ef950d0eccdbc09f715ae953d8d57fd803957c98e287d444f3550

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