Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb6d6bf9fcc1e92…

MALICIOUS

PDF

45.1 KB Created: 2020-08-22 17:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89ef973694352d761572256242cf42f0 SHA-1: c1a9334a72e73fc069bc57b8ed16a092235c6cee SHA-256: cdb6d6bf9fcc1e923c7222bdee7e8315f3642a21b8c732c101aa9008eb3edcd5
120 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a PDF related to 'bd chaurasia anatomy pdf 7th edition', which is likely a lure. The primary malicious URL identified is https://ttraff.cc/pify?keyword=bd+chaurasia+anatomy+pdf+7th+edition, which is used to redirect the user to further malicious content. The presence of a link farm heuristic further supports the malicious intent of distributing links.

Heuristics 3

  • 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.
  • 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=bd+chaurasia+anatomy+pdf+7th+edition
    • http://nupagu.reviewgraphs.com/uploads/1/3/1/6/131636825/jizamitolozit.pdf
    • http://gazitoxek.richfeenstra.com/uploads/1/3/1/4/131454215/soxewedulu_xunoromurato.pdf
    • http://files.ipuwaifarm.co.nz/uploads/1/3/2/7/132710603/4312612.pdf
    • http://gotoji.moenkopimemories.org/uploads/1/3/1/6/131606490/8390495.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ridojunewosinojep.pdf
    • https://cdn.shopify.com/s/files/1/0451/0665/9493/files/secured_copy_text.pdf
    • https://cdn.shopify.com/s/files/1/0430/6403/3429/files/lusakixejerubutelasi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4026/8711/files/79882712050.pdf
    • https://cdn.shopify.com/s/files/1/0435/7442/7811/files/9152167977.pdf
    • https://cdn.shopify.com/s/files/1/0437/1755/8426/files/fundamentals_of_general_organic_and_biological_chemistry_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0449/8430/3775/files/xinokilurodamawi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0917/0856/files/lekizogemo.pdf
    • https://cdn.shopify.com/s/files/1/0466/4459/2805/files/free_5th_grade_math_worksheets_multiplication.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/vezanuraxepoxaxajazum.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1935/files/65465551714.pdf
    • https://cdn.shopify.com/s/files/1/0434/4587/8950/files/sonekebalepoba.pdf
    • https://cdn.shopify.com/s/files/1/0431/3507/4465/files/25522718612.pdf
    • https://cdn.shopify.com/s/files/1/0439/4015/1454/files/fiduburulejeje.pdf
    • https://cdn.shopify.com/s/files/1/0432/4986/0765/files/45305155358.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_off00007199.bin
8426273136341f60806df5fd8264e7d5123385471fe071edf4c066f113e4dffd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7199 5592 bytes
font_01_sfnt_off00008480.bin
557a8a379b779365ddb8fb2906207be4ce40b7b689dc9318f4952c515ee0360b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8480 10052 bytes