Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d230422861cca79…

MALICIOUS

PDF

46.2 KB Created: 2020-08-12 20:40:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff5e15512fd08b8f824024d4f5679318 SHA-1: 04bf2af609d4213b9c6f73e3193d4b7a66b9c12f SHA-256: 5d230422861cca79711daf27f4d5acfe2ba1ca490985b153f79071ec4c39aa89
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 PDF files, suggesting a link farm or SEO manipulation tactic. One prominent link, 'https://ttraff.cc/pify?keyword=7+step+air+brake+test+pdf', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text and embedded URLs, indicating an attempt to disguise malicious content.

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.cc/pify?keyword=7+step+air+brake+test+pdf
    • http://files.sidwazboutique.com/uploads/1/3/1/3/131398292/mirejifa.pdf
    • http://files.positivebirthportsmouth.org/uploads/1/3/0/7/130775678/kejusorofazonej.pdf
    • http://files.shawtyreservices.com/uploads/1/3/2/6/132681634/jonafotejotadise.pdf
    • http://misusirim.marcorporation.net/uploads/1/3/1/8/131872225/e76acdd8671.pdf
    • http://files.midcenturycloseout.com/uploads/1/3/0/7/130740586/mikikomurunikobi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/atomic_structure_of_hydrogen.pdf
    • https://cdn.shopify.com/s/files/1/0452/6951/6449/files/paises_y_nacionalidades_en_ingles_para_nios.pdf
    • https://cdn.shopify.com/s/files/1/0431/5385/0524/files/bringers_of_light_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/87266762363.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1764/files/89863768185.pdf
    • https://cdn.shopify.com/s/files/1/0430/3519/7602/files/biology_notes_for_class_11_chapter_4.pdf
    • https://cdn.shopify.com/s/files/1/0447/8923/5861/files/java_7_32_bit_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/5428/5479/files/79675142232.pdf
    • https://cdn.shopify.com/s/files/1/0432/6627/7531/files/gobuwoginupuruboxafo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6974/2999/files/25661986223.pdf
    • https://cdn.shopify.com/s/files/1/0448/0407/9778/files/balasaheb_shinde_english_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/2957/6352/files/gudifatolenipuxar.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_off00006a48.bin
a87bebbec3b86eefb9acfeb2b3ac7eb7c52c3e5616dde64e0c2611c16507cdd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A48 4764 bytes
font_01_sfnt_off00007a82.bin
8cb7c6b30f82aacc6342d1362fca1f5065a2f4c9238c495a21d432d2b200c2ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A82 10352 bytes
font_02_sfnt_off00009dec.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DEC 4324 bytes

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