Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee34ce17b629d16…

MALICIOUS

PDF

46.0 KB Created: 2020-08-25 12:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb4689cde931f3d14ac191f8e7086b3a SHA-1: 33a7da1eeadc6d77dec20b65226dbae34840e2e3 SHA-256: 8ee34ce17b629d16b16a4c5e5ef43546267aac6b34ec388c5b98dca8e23307d3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=cubic+equation+word+problems+worksheet'. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on Shopify, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive link within the document.

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=cubic+equation+word+problems+worksheet
    • http://rabixo.blumenflor.com/uploads/1/3/0/7/130739017/8455338.pdf
    • http://files.fightnightblog.com/uploads/1/3/1/3/131382470/xejusovipokubiweri.pdf
    • http://lapofuk.tonchahardwood.ca/uploads/1/3/0/8/130813528/fojorezawutid-dokefugeg-gilitigubatexu.pdf
    • http://files.cooperandclaire.com/uploads/1/3/0/7/130776073/ponavawabukakekog.pdf
    • http://files.murray-clan-nsw.net/uploads/1/3/0/8/130814605/1a165c711aec4a6.pdf
    • https://cdn.shopify.com/s/files/1/0452/3137/4493/files/8727210895.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3845/files/wofaziwakoxejenidipukiwet.pdf
    • https://cdn.shopify.com/s/files/1/0432/5716/8027/files/4256201114.pdf
    • https://cdn.shopify.com/s/files/1/0435/7187/1912/files/altivar_212_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/1976/2840/files/corel_video_studio_intro_templates_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/9801/1816/files/70998186361.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2277/files/island_in_the_sun_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/8589/7627/files/bully_scholarship_edition_compressed.pdf
    • https://cdn.shopify.com/s/files/1/0433/0808/9509/files/13989546043.pdf
    • https://cdn.shopify.com/s/files/1/0431/2442/4853/files/mushin_esoteric_text.pdf
    • https://cdn.shopify.com/s/files/1/0434/8562/6520/files/wujebofikanegitid.pdf
    • https://cdn.shopify.com/s/files/1/0447/4054/2618/files/anemia_defisiensi_besi_ibu_hamil.pdf
    • https://cdn.shopify.com/s/files/1/0432/2924/9694/files/sample_annotated_bibliography_mla.pdf
    • https://cdn.shopify.com/s/files/1/0462/4400/3989/files/android_studio_sdk_location_osx.pdf
    • https://cdn.shopify.com/s/files/1/0434/5951/0425/files/97887798424.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_off00006d4c.bin
23cdcc3b9ed37d0ac465cde62f9f683586d4101ec3e748fed598c6d385a38414		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D4C 5640 bytes
font_01_sfnt_off0000804b.bin
31f32e1ae3ccc30958df617321703ae9588a395fce294eacf3187204b7b59d4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x804B 13428 bytes

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