Malicious PDF — malware analysis report

Static analysis result for SHA-256 0495fa1ad59a3d5f…

MALICIOUS

PDF

46.3 KB Created: 2020-08-11 14:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f03b2c78dbe486f06f1ec16a25570e84 SHA-1: e54c9c6853e0fa666e886c358be92cc54635e37d SHA-256: 0495fa1ad59a3d5ff6fa4bd692a7cff700a878c590be5780c6888cf528cfd8c9
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though partially obfuscated, contains the primary malicious URL and suggests a lure related to CSS and PDF resources. The presence of many external PDF links further indicates a link farm or distribution mechanism. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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.ru/pify?keyword=aide+m%25C3%25A9moire+css+pdf
    • http://rasuto.chicpool.com/uploads/1/3/1/0/131071243/dekapajare.pdf
    • http://bajar.hoylandspringwood.org/uploads/1/3/0/8/130873851/sulobenavoraxesenu.pdf
    • http://files.wazzuor.com/uploads/1/3/0/7/130775753/lakikujaxodezova.pdf
    • http://wovigis.bellasdiscoverys.com/uploads/1/3/1/4/131406390/keziguduwuzixowomag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0451/3798/5690/files/1328652397.pdf
    • https://cdn.shopify.com/s/files/1/0430/8959/2473/files/17018692820.pdf
    • https://cdn.shopify.com/s/files/1/0434/7455/0949/files/kipaxejurijuweberowukesi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0310/0832/files/programa_para_unir_en_uno_solo_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0435/5352/1823/files/cancionero_infantil_para_guitarra.pdf
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/waderivopo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6968/6431/files/bleach_opening_2.pdf
    • https://cdn.shopify.com/s/files/1/0429/8289/9871/files/lakakumimir.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17232613021.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93527538138.pdf
    • https://cdn.shopify.com/s/files/1/0430/9526/1348/files/dotaxirewe.pdf
    • https://cdn.shopify.com/s/files/1/0434/6901/3144/files/88200737993.pdf
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/fonarakalubu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069a5.bin
e638da1a9740551e4935c0b8919cd4a809950c0d3174ae4c6a7f86f6c8904a7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A5 5192 bytes
font_01_sfnt_off00007aed.bin
4600590f1e4ac0c83d506884166c554884dc3af3acae19483d842704a740f8b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AED 15328 bytes

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