Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f6bab25e97a12d…

MALICIOUS

PDF

34.9 KB Created: 2020-08-21 18:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43365d402c0a9bf7c05de0d2b5a8b02e SHA-1: aba9011d54956a6da31cfd022b2e2903ae1b3eb3 SHA-256: 52f6bab25e97a12db745fd0f8e0e8c55a77503f98e971ba654f85625b286636a
128 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which are part of a link farm designed to improve search engine rankings. One prominent link, presented as a download for an English grammar book, redirects to a known malicious domain (ttraff.ru). This indicates a social engineering tactic to trick users into visiting a malicious site, likely for further exploitation or credential harvesting.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=a+practical+english+grammar+exercises+1+pdf
    • http://files.stakeholders-act.org/uploads/1/3/1/4/131413362/1747374.pdf
    • https://cdn.shopify.com/s/files/1/0434/6327/8758/files/limestone_calcined_clay_cement.pdf
    • https://cdn.shopify.com/s/files/1/0451/3693/7125/files/free_printable_texas_bill_of_sale_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/1557/7504/files/titazotixe.pdf
    • https://cdn.shopify.com/s/files/1/0437/2434/1400/files/likutujetedabip.pdf
    • https://cdn.shopify.com/s/files/1/0438/9208/0795/files/55675838691.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53151925343.pdf
    • https://cdn.shopify.com/s/files/1/0429/7631/3503/files/english_grammar_book_for_competitive_exam.pdf
    • https://cdn.shopify.com/s/files/1/0440/3258/9989/files/englisch_passive_voice_bungen.pdf
    • https://cdn.shopify.com/s/files/1/0431/0279/7986/files/lepik.pdf
    • https://cdn.shopify.com/s/files/1/0431/1177/6416/files/zegagerilujixesimozaz.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/nitro_to_word_converter_crack.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_off00004a86.bin
7a82f516dc4df425a0f84d4f2717c432e3a8cae1fabb163c78989d972f4c2168		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A86 5676 bytes
font_01_sfnt_off00005daf.bin
66dc4ade12595e84b0e68a0de3479352d11e9a271f8f196423b569c92986c360		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DAF 9820 bytes

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