Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1d9af01e77fa54…

MALICIOUS

PDF

42.1 KB Created: 2020-08-08 14:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d58bcf7e4b8e46045ed94a724d94f34 SHA-1: 9b079b51bfa6369257f928edca911ca5293c2398 SHA-256: 5f1d9af01e77fa545e4b4e73d5a40dee23621fbb7274ef61460dade23d4030a2
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a PDF SEO link farm. The primary malicious URL, https://ttraff.ru/, is flagged as a known malicious redirector. While no scripts were extracted, the document body contains obfuscated text and embedded URLs, suggesting an attempt to lure users to malicious sites, likely for phishing or malware distribution.

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/wb?keyword=has%20been%20have%20been%20had%20been%20exercises%20pdf
    • http://files.artvallein.com/uploads/1/3/1/4/131409385/1895327.pdf
    • http://lijuto.concordneuropsych.com/uploads/1/3/2/7/132740405/lojidigodeze_kuripaxemesep.pdf
    • http://files.chloelabart.com/uploads/1/3/2/6/132681660/ruvazajikafu_nokegogekuw_zogubujaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekosipavejidowusa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8658/files/mofiziparapopifag.pdf
    • https://cdn.shopify.com/s/files/1/0452/6043/9713/files/convertir_de_a_word_editable_sin_perder_formato_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0431/7242/9980/files/sazidatupujeba.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xamunodobesezuwenetubaf.pdf
    • https://cdn.shopify.com/s/files/1/0427/8065/5775/files/daxuduwodafotoloziv.pdf
    • https://cdn.shopify.com/s/files/1/0434/7140/5222/files/instant_notes_genetics_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/3067/4597/files/pabazetapapabuwelobowukiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/0971/2021/files/kb_mb_gb.pdf
    • https://cdn.shopify.com/s/files/1/0434/3591/7464/files/bogivubuvakogumenibasofa.pdf
    • https://cdn.shopify.com/s/files/1/0434/5747/8823/files/75172280774.pdf
    • https://cdn.shopify.com/s/files/1/0429/7005/4805/files/jimoxudonetamafux.pdf
    • https://cdn.shopify.com/s/files/1/0433/4934/4421/files/nabajuxid.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_off00005a54.bin
8f63f9c6bbe197c75f4e7768f6a3f2479c65205c280e94d6dfc25c0a3c380807		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A54 5036 bytes
font_01_sfnt_off00006b58.bin
2b21b6e996b93304f34064047cf06f427ed00f392a54a6d5bd237d3044991c8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B58 9840 bytes
font_02_sfnt_off00008d17.bin
8405bb6ca9a6fb718a2e910e1cdde4d74ac2122cab0061dc5f772322db9c7ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D17 4324 bytes

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