Malicious PDF — malware analysis report

Static analysis result for SHA-256 b156cbc0ba3043f2…

MALICIOUS

PDF

50.0 KB Created: 2020-08-16 11:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38ca8ac5f19d473ed8214bd6581a5e4f SHA-1: 3d9b4b6f57aeb9789ff2b07bcb59700907c89b7f SHA-256: b156cbc0ba3043f2a8bb3ea72e409eae7396d32925d34945d9b524981b7f0f49
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.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The document body, though heavily obfuscated, contains the malicious URL and several benign-looking Shopify URLs, suggesting a lure. The primary malicious URL is likely used to redirect users to a phishing or malware distribution site.

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=bakra+bali+video
    • http://jasozop.buzitsolutions.com/uploads/1/3/1/8/131856725/80087b.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2485/files/43191702589.pdf
    • https://cdn.shopify.com/s/files/1/0437/8945/1416/files/mosfet_differential_amplifier.pdf
    • https://cdn.shopify.com/s/files/1/0432/8253/0472/files/25919357931.pdf
    • https://cdn.shopify.com/s/files/1/0433/7873/7302/files/printable_calligraphy_practice_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/9948/0473/files/adenosina_bula_hipolabor.pdf
    • https://cdn.shopify.com/s/files/1/0435/1341/3791/files/dusagaretifolatitikut.pdf
    • https://cdn.shopify.com/s/files/1/0430/9896/4117/files/benzodiazepnicos_intoxicao.pdf
    • https://cdn.shopify.com/s/files/1/0430/7651/8049/files/73621003866.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3358/files/rumuvuwejokukogafulavafa.pdf
    • https://cdn.shopify.com/s/files/1/0434/2376/0536/files/19637064730.pdf
    • https://cdn.shopify.com/s/files/1/0432/5307/2022/files/33831421011.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/zukavanez.pdf
    • https://cdn.shopify.com/s/files/1/0429/2490/0515/files/kuxilikoloxavaketofe.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_off00006e6d.bin
0a8c23b0eac0c1b37b8bd49871b7247c629c692fa30bbe439d799e008811712b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E6D 4952 bytes
font_01_sfnt_off00007f58.bin
0da1520d0c125e8aa26c9d1bdbd06288905adf54480f03fd9cb3d1b42efa6d65
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F58 2956 bytes
font_02_sfnt_off00008bc7.bin
451064aaa467a1557b4c3a6e77ca907d959bea0525e0b342bb2965a65bd3ec1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC7 15084 bytes