Malicious PDF — malware analysis report

Static analysis result for SHA-256 8855ccc070c3d0b0…

MALICIOUS

PDF

43.0 KB Created: 2020-08-23 06:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 537d0f9d92c6875577d6ee1a0b75d102 SHA-1: 642cc548f5f2fd0922738779978fd0755fe0adc0 SHA-256: 8855ccc070c3d0b04755b144e71b3d19a6f544355f312fdf1c7f3a077a94e159
162 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The document body, though partially corrupted, contains text related to software conversion and includes the malicious URL. The presence of a 'download button' heuristic further supports a social engineering lure. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to drive traffic to malicious sites, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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
  • 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=convert+bmp+to+jpg+software+free
    • http://files.nicolepachecomakeup.com/uploads/1/3/2/6/132681322/fejemarifabifa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1049/0519/files/boss_me_25_manual_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4698/files/8326173527.pdf
    • https://cdn.shopify.com/s/files/1/0429/5353/9747/files/journal_ledger_cash_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/auscultation_skills_breath_and_heart_sounds.pdf
    • https://cdn.shopify.com/s/files/1/0431/8674/9604/files/91006266249.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0492/files/16226180189.pdf
    • https://cdn.shopify.com/s/files/1/0431/2485/0842/files/moral_values_definition.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/tactics_for_listening_third_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/7610/8956/files/63666423492.pdf
    • https://cdn.shopify.com/s/files/1/0440/7063/3624/files/wozivedapevum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0802/3966/files/schindler_s_list_partitura_violin.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/kikizatofofebinaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0012/6885/files/sejarah_bilangan_bulat.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2217/files/active_voice_passive_voice.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_off000069ed.bin
34c9c85b7a98a4e0e9e7b577d0ef8eb227f9c03205e47804a71416f37d185eca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69ED 5464 bytes
font_01_sfnt_off00007c89.bin
1994df47b6394f71bded5590373c4d3dcac167f8cf2bf5d58a2a4cca900ff947		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C89 10120 bytes

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