Malicious PDF — malware analysis report

Static analysis result for SHA-256 9883e69b1f2bdd69…

MALICIOUS

PDF

42.6 KB Created: 2020-08-15 00:40:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf69aa4ee3c9e69be1ae31b56ce21ad8 SHA-1: 873255d94a214d1292cba0027dc55362acf9318d SHA-256: 9883e69b1f2bdd69c007fa0e58383e505ea0a4710e2fcbce54bedcf44f9ff326
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a 'sample teacher lesson plan template'. This heuristic, combined with the ML classifier flagging the PDF as malicious, strongly suggests a phishing or social engineering attack. The document body also contains numerous links to external PDF files, indicating a link farm designed to potentially distribute further malicious content or engage in SEO manipulation.

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.com/pify?keyword=sample+teacher+lesson+plan+template
    • http://files.phchastings.org/uploads/1/3/0/9/130969573/b4f516e65e2266.pdf
    • http://boxes.chapelheightsumceauclaire.com/uploads/1/3/1/3/131379290/sebefoxadej.pdf
    • https://cdn.shopify.com/s/files/1/0433/8548/7516/files/66542175097.pdf
    • https://cdn.shopify.com/s/files/1/0428/6706/4991/files/dnd_giant_rat.pdf
    • https://cdn.shopify.com/s/files/1/0438/1189/7504/files/rubemamuvopapus.pdf
    • https://cdn.shopify.com/s/files/1/0433/4505/1797/files/49408902637.pdf
    • https://cdn.shopify.com/s/files/1/0438/2159/6834/files/coordinate_geometry_notes_for_ssc_cgl.pdf
    • https://cdn.shopify.com/s/files/1/0439/8658/3710/files/coronally_advanced_flap.pdf
    • https://cdn.shopify.com/s/files/1/0431/0489/5143/files/1_to_1000_numbers_in_english_words_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6142/7867/files/wuvufozetatixipamuwo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7759/9383/files/english_speaking_practice_at_home.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6184/files/watermark_powerpoint.pdf
    • https://cdn.shopify.com/s/files/1/0432/6404/9318/files/xisatuvedepuxoripito.pdf
    • https://cdn.shopify.com/s/files/1/0440/5503/6054/files/suzabuvikikowifatope.pdf
    • https://cdn.shopify.com/s/files/1/0430/2526/8889/files/cabeza_de_vaca_la_relacion.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_off00005fdc.bin
bbc423d96a17605d7f37d7749b294905352f4fb37ae789fdc15c18c3fe8ff7fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDC 5276 bytes
font_01_sfnt_off000071a2.bin
d9effef088ceef376e0eef6d370862f9c8fb52767dd6e4dca37f2a51a8d7c136
pdf-font-stream PDF embedded font (sfnt) at offset 0x71A2 13960 bytes