Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93193ae51b328d6…

MALICIOUS

PDF

42.0 KB Created: 2020-08-19 18:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38b6b049a11c7c3f671906a50def92e7 SHA-1: c838c812ad0eb9d4d0539b6c1c43ae5b26a6c779 SHA-256: f93193ae51b328d63ba8963e4ef7d329d66ad24a02ba6fcef6bab8ebe0c4dbe2
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One prominent link, however, leads to a known malicious redirector at 'ttraff.ru' with a search query for "certificate templates microsoft publisher free". This indicates a likely phishing or malware distribution attempt, leveraging SEO tactics to appear legitimate. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious redirector is a strong indicator of malicious intent.

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=certificate+templates+microsoft+publisher+free
    • http://files.dats-il.com/uploads/1/3/2/6/132682171/fefute.pdf
    • http://rumun.privatecounsellingandmediation.com/uploads/1/3/0/7/130775565/6f575.pdf
    • https://cdn.shopify.com/s/files/1/0432/8561/0654/files/51699223578.pdf
    • https://cdn.shopify.com/s/files/1/0438/3975/0294/files/51459559132.pdf
    • https://cdn.shopify.com/s/files/1/0431/2432/6566/files/environment_agency_culvert_design_guide.pdf
    • https://cdn.shopify.com/s/files/1/0439/4903/1592/files/calidad_de_vida_en_el_trabajo_juana_patlan.pdf
    • https://cdn.shopify.com/s/files/1/0430/1455/3763/files/58981715163.pdf
    • https://cdn.shopify.com/s/files/1/0432/8266/1526/files/gotivurijepuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/6305/8325/files/alone_heart_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/9216826055.pdf
    • https://cdn.shopify.com/s/files/1/0432/0487/0305/files/metabolomics_book.pdf
    • https://cdn.shopify.com/s/files/1/0438/4751/6325/files/11156270839.pdf
    • https://cdn.shopify.com/s/files/1/0431/0056/9766/files/4883311643.pdf
    • https://cdn.shopify.com/s/files/1/0435/1007/1460/files/1087877247.pdf
    • https://cdn.shopify.com/s/files/1/0437/2506/2298/files/8379525862.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0690/files/wezisexufujisemevoge.pdf
    • https://cdn.shopify.com/s/files/1/0431/2625/9876/files/how_do_you_cheat_in_cookie_clicker.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000677a.bin
39fe862bea8a28c89954dac890dff4a9bb80c48b1ad4f4fafb6af0453791d530		 pdf-font-stream PDF embedded font (sfnt) at offset 0x677A 5300 bytes
font_01_sfnt_off0000794d.bin
fe944f4e5ed6d861a9781c44b438753b19c2c03136a09e5c952ea4a95c363791		 pdf-font-stream PDF embedded font (sfnt) at offset 0x794D 9792 bytes

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