Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d346b64aaaba1c…

MALICIOUS

PDF

41.3 KB Created: 2020-08-24 00:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 665c77b116ed06351c73a01f23e17227 SHA-1: 91ab395a2227b0aa7403a07579765791f550f075 SHA-256: 16d346b64aaaba1c83e52b1b785280300bf47297e5ecdf2b41ba522c1420185a
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a solution to an Excel problem. This suggests a phishing or social engineering attempt to direct users to malicious infrastructure. The document body also contains the URL for the redirector, reinforcing the lure. While no scripts were extracted, the presence of numerous PDF links, many pointing to Shopify, indicates a potential link farm or content distribution strategy.

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=can%2527+t+add+a+worksheet+in+excel
    • http://files.purplepotters.com/uploads/1/3/0/7/130739699/fopuni-wulol-sezabuwerefuwo.pdf
    • http://files.kudzustudio.com/uploads/1/3/0/8/130814926/buviv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7554/1919/files/christian_premarital_counseling_questionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0428/6028/2023/files/68353290596.pdf
    • https://cdn.shopify.com/s/files/1/0435/4870/4920/files/effect_of_acid_rain_on_plants.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/budget_2020_20_date_pakistan.pdf
    • https://cdn.shopify.com/s/files/1/0441/2715/8424/files/wadebewupus.pdf
    • https://cdn.shopify.com/s/files/1/0430/2195/9325/files/la_boite_a_merveille_complet.pdf
    • https://cdn.shopify.com/s/files/1/0432/4704/2715/files/sakubafivufewixole.pdf
    • https://cdn.shopify.com/s/files/1/0430/1645/4305/files/61064264550.pdf
    • https://cdn.shopify.com/s/files/1/0435/0348/5092/files/45302959683.pdf
    • https://cdn.shopify.com/s/files/1/0434/7595/9973/files/vashikaran_mantra_in_telugu_free_download.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_off000064bf.bin
2a6e88c089f68efe0ddfc75f62177173b046fdc551a04babae4261e5bc9de5b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x64BF 5192 bytes
font_01_sfnt_off0000767b.bin
c480a57338992b030e0dd8daffe6e54e6f610a7d76f312ae8fd5678c9f9fa0c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x767B 9800 bytes