Malicious PDF — malware analysis report

Static analysis result for SHA-256 57622b393062e485…

MALICIOUS

PDF

46.9 KB Created: 2020-08-18 16:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb39e534ee670b72758f262ff68910c9 SHA-1: 2856aed2ad50cbb6f82dbf1782ca6f796c891fc1 SHA-256: 57622b393062e4856d802505a81895938c01829387dd14b4e33737ca89939a72
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious Link

The PDF contains a large number of embedded links, with a critical heuristic firing for a PDF link redirector and a PDF SEO link farm. The primary malicious URL identified is https://ttraff.cc/pify?keyword=back+arrow+on+toolbar+android, which is likely used for redirection. The document body contains garbled text and a reference to the same malicious URL, suggesting it's part of a lure or obfuscation technique. The ML classifier also strongly flagged this PDF as malicious.

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=back+arrow+on+toolbar+android
    • http://files.interactivecapitalgroup.com/uploads/1/3/1/4/131455463/80b796823c215.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/julanefiwozuxam.pdf
    • https://cdn.shopify.com/s/files/1/0427/8091/7926/files/egomanaco_livro_minhateca.pdf
    • https://cdn.shopify.com/s/files/1/0430/4997/5959/files/89704184242.pdf
    • https://cdn.shopify.com/s/files/1/0430/0288/8351/files/2436824124.pdf
    • https://cdn.shopify.com/s/files/1/0446/9604/3674/files/venn_diagram_word_problems.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6384338271.pdf
    • https://cdn.shopify.com/s/files/1/0432/9652/2398/files/95846146740.pdf
    • https://cdn.shopify.com/s/files/1/0434/3716/2657/files/introduction_to_biological_anthropology_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5079/files/international_financial_management_eun_resnick.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4698/files/www_insightsc3m_com.pdf
    • https://cdn.shopify.com/s/files/1/0428/5097/5910/files/dofesunawu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1835/3815/files/2020_annual_calendar_template.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064f3.bin
fed474c3cfd8260551196dbe7da70ab492d99d9ced4ababe071947c532996e24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F3 5100 bytes
font_01_sfnt_off00007662.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7662 1800 bytes
font_02_sfnt_off00007ef0.bin
a166f65b0dbfbd0e1d7cad7444d6c468247c4ca077d0d5e97301fca2d8a1e068		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF0 15344 bytes

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