Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb625481f52882d4…

MALICIOUS

PDF

45.7 KB Created: 2020-08-22 07:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5bdb8cbda3690bc9e3d9fc2dd58c41c SHA-1: c2f0a9caadea8173d31a839a50b6c2f85843ee5e SHA-256: bb625481f52882d41c2aa3d41885257efdf3ac5bb261c4cae301967b5070461d
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.com/pify?keyword=quenching+heat+treatment+pdf'. This URL is likely used to redirect the user to a malicious site. The document also contains a large number of embedded URLs, many hosted on Shopify, which is characteristic of SEO link farm techniques used to obscure malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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=quenching+heat+treatment+pdf
    • http://wunolu.micropapillarybreastcancer.org/uploads/1/3/2/6/132682883/magelukidukavotoguj.pdf
    • https://cdn.shopify.com/s/files/1/0429/8529/1937/files/hoe_een_bestand_kleiner_maken.pdf
    • https://cdn.shopify.com/s/files/1/0435/8720/7327/files/81045201053.pdf
    • https://cdn.shopify.com/s/files/1/0462/6812/1237/files/excel_consolidating_data_from_multiple_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0437/3151/7605/files/wafatijijukaboti.pdf
    • https://cdn.shopify.com/s/files/1/0432/7754/9726/files/96818132292.pdf
    • https://cdn.shopify.com/s/files/1/0435/5765/0584/files/thermal_foundation_1._12._2.pdf
    • https://cdn.shopify.com/s/files/1/0437/8699/3813/files/uk_phone_number_format.pdf
    • https://cdn.shopify.com/s/files/1/0435/2458/7674/files/sivalovu.pdf
    • https://cdn.shopify.com/s/files/1/0430/1540/5725/files/fmge_notes_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/3170/8316/files/management_of_abdominal_compartment_syndrome.pdf
    • https://cdn.shopify.com/s/files/1/0431/7518/2496/files/17721860394.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/patidozaxi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067c1.bin
a6cd3a07cd2c06963d19d5b6ebbe6295868b73370c5cbc8c60942788c3c8c07c
pdf-font-stream PDF embedded font (sfnt) at offset 0x67C1 5192 bytes
font_01_sfnt_off0000793d.bin
e7e7ad213cca86b36367696ba9dd576ef951418146b9056d2a20ead0f864db0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x793D 10104 bytes
font_02_sfnt_off00009ba9.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9BA9 4324 bytes