Malicious PDF — malware analysis report

Static analysis result for SHA-256 66febb57d7780a9c…

MALICIOUS

PDF

56.9 KB Created: 2020-08-22 19:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a21041efac3b29b6e5139d335a1ed2de SHA-1: 85560f019366f01c455b76ecd315930020a2cad9 SHA-256: 66febb57d7780a9c254110ef7eae86fbf1f0468ce64e384fc3c34761978dab57
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to benign Shopify URLs, but also includes a critical link to a known malicious redirector at 'ttraff.ru'. The ML classifier strongly flagged this PDF as malicious. The presence of a 'download button' lure further supports a phishing or scam attempt, likely designed to redirect users to malicious content.

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=newspaper+template+psd+free
    • http://files.cresaptowneagles2883.com/uploads/1/3/1/4/131437380/renijoxinenivitevexi.pdf
    • http://zetoxe.annalisavivona.com/uploads/1/3/1/4/131437792/6aba9f75b7cd3.pdf
    • http://files.dollupwithteacups.com/uploads/1/3/1/8/131857421/53a986c035c34.pdf
    • http://files.commasense.net/uploads/1/3/2/6/132695714/zowinaju.pdf
    • http://batula.amandakloy.com/uploads/1/3/2/3/132302978/93549c6533480.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/4234/7927/files/gseb_11th_science_biology_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0436/4691/0624/files/88652563277.pdf
    • https://cdn.shopify.com/s/files/1/0432/3845/7504/files/netibokugawikumapezosa.pdf
    • https://cdn.shopify.com/s/files/1/0440/6562/0118/files/82826280546.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/vezigamigezuvokewukulego.pdf
    • https://cdn.shopify.com/s/files/1/0431/1888/7068/files/pebunufedax.pdf
    • https://cdn.shopify.com/s/files/1/0429/9449/9743/files/dasivawatobolitijoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/8934/7228/files/chiltons_manual_online.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6359/files/dananezizaxajekoduzipo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9476/9821/files/12690771390.pdf
    • https://cdn.shopify.com/s/files/1/0438/4355/1392/files/ielts_writing_task_1_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/2730/7423/files/cryptic_movie_quiz_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/2372/7783/files/pixma_ip7220_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000964c.bin
3a05c81c63f356def0e2ae7b78962485d934d2cfba9d8548c66de861896f2163
pdf-font-stream PDF embedded font (sfnt) at offset 0x964C 4772 bytes
font_01_sfnt_off0000a692.bin
08a4567e71ff4af17e3216e8ca2f9a1e7203e68c980fe96599f192c58ffc8ded
pdf-font-stream PDF embedded font (sfnt) at offset 0xA692 9788 bytes
font_02_sfnt_off0000c819.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0xC819 4324 bytes