Malicious PDF — malware analysis report

Static analysis result for SHA-256 864a551346854daa…

MALICIOUS

PDF

43.5 KB Created: 2020-08-17 02:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e33e5e990183b9f76f26d3b3edc307b SHA-1: ad6fcac6706f441a18ad72790c03e076120a59cf SHA-256: 864a551346854daa5c26b2507a48d1237784d86803311afe679f4a4137530669
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector URL, which is a common tactic for phishing and malware distribution. The document body, though heavily obfuscated, contains text related to conjugation and the tool used to generate the PDF, suggesting a lure. The presence of a link farm heuristic further indicates malicious intent to direct users to external sites.

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=coniugazione+vestire+forma+riflessiva
    • http://tefowuro.harveyrpeck.net/uploads/1/3/1/4/131407736/mebiwuso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2652/9956/files/xupodepiriw.pdf
    • https://cdn.shopify.com/s/files/1/0432/3203/4976/files/tasebilesoxubiv.pdf
    • https://cdn.shopify.com/s/files/1/0440/5572/4197/files/wiley_addiction_treatment_planner.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vunumegosuvuvorewufo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9381/files/12987804054.pdf
    • https://cdn.shopify.com/s/files/1/0434/1635/4977/files/bienestar_animal_en_mataderos.pdf
    • https://cdn.shopify.com/s/files/1/0433/2408/0282/files/biomassa_energia_renovavel.pdf
    • https://cdn.shopify.com/s/files/1/0438/2729/8461/files/50289338835.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/electroencephalography_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7318/files/smough_s_great_hammer.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057bc.bin
1488725821f80b393ea4c4f31bcc19a28e5ca56d153ed5728bd9622803d5141b
pdf-font-stream PDF embedded font (sfnt) at offset 0x57BC 5104 bytes
font_01_sfnt_off00006914.bin
d2648fc9395ff403f3a6389a77a809fa20138a0aaed783b0e76275906aa1325b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6914 10652 bytes
font_02_sfnt_off00008c59.bin
e5245523bd71a78e06ca3300da63f55ad096e28dd8c1a5e83e138be64f7d0aee
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C59 16084 bytes