Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb87fc0d73d028c…

MALICIOUS

PDF

53.8 KB Created: 2020-07-26 07:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cad926da43832d500d17cf03424618fb SHA-1: 5e0411bca7062c3fe93fce07084467393744a150 SHA-256: 9bb87fc0d73d028c91e9e82791b72c7336b5b2d80952d49770b8e3810c0ebe2e
152 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 'ttraff.cc'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including one hosted on 'cdn.shopify.com'. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains text related to 'free bossa nova music' and wkhtmltopdf, suggesting a lure to disguise the malicious intent.

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=free+bossa+nova+music
    • http://files.carpetcleaningrestorationmarketing.com/uploads/1/3/2/6/132682030/nevuvojedig-zovub.pdf
    • http://files.easyhungarian.com/uploads/1/3/1/3/131379042/09fa07b4cfdb33e.pdf
    • http://files.armacharlottepiedmont.org/uploads/1/3/0/7/130739027/6efe5ac2.pdf
    • http://files.illuminatepainting.com/uploads/1/3/0/7/130776601/latudutinixujukefug.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/42640543714.pdf
    • https://cdn.shopify.com/s/files/1/0436/1519/1202/files/pakibasazudubos.pdf
    • https://cdn.shopify.com/s/files/1/0440/6693/0840/files/65156387470.pdf
    • https://cdn.shopify.com/s/files/1/0432/0342/8510/files/46103221494.pdf
    • https://cdn.shopify.com/s/files/1/0433/2394/9224/files/19828744943.pdf
    • https://cdn.shopify.com/s/files/1/0434/2205/6600/files/59787410667.pdf
    • https://cdn.shopify.com/s/files/1/0435/2881/4746/files/risagaxeb.pdf
    • https://cdn.shopify.com/s/files/1/0435/7252/7267/files/girojebuwegexo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78549170372.pdf
    • https://cdn.shopify.com/s/files/1/0430/7009/5521/files/pupagenorebetexujon.pdf
    • https://cdn.shopify.com/s/files/1/0430/9948/8423/files/46757382600.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/92255133457.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_off0000964e.bin
e9083044352072fb82610da3b186c06ec945bac16c6d4491aa7e01ad151c082d
pdf-font-stream PDF embedded font (sfnt) at offset 0x964E 4868 bytes
font_01_sfnt_off0000a6bd.bin
1301e75ac00aeb871136a85dd3ccf69a628aa681b50d0f6a2eba5e3a657dd4de
pdf-font-stream PDF embedded font (sfnt) at offset 0xA6BD 10188 bytes