Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8693d3af563628a…

MALICIOUS

PDF

62.8 KB Created: 2020-08-31 01:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37445ed96b3318b6180aa516b2bdb84e SHA-1: 4c1b0fd67101c440c0dbbcba2b4db1d7f6ff5edf SHA-256: b8693d3af563628af5a4c609f1e1f71914a519278927b0d2e560f2dd566c0ee2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs, many hosted on cdn.shopify.com. One of the primary URLs, https://ttraff.com/wix?keyword=mapa+hidrografico+del+mundo, is identified as a malicious redirector. The document body contains garbled text but includes the malicious URL and several benign-looking PDF links.

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/wix?keyword=mapa+hidrografico+del+mundo
    • https://cdn.shopify.com/s/files/1/0430/1540/5725/files/vinubovuko.pdf
    • https://cdn.shopify.com/s/files/1/0438/0255/8621/files/introduction_of_differential_calculus.pdf
    • https://cdn.shopify.com/s/files/1/0428/0025/1036/files/43375593616.pdf
    • https://cdn.shopify.com/s/files/1/0431/6728/5408/files/selurawivilabo.pdf
    • https://static.usrfiles.com/ugd/b8c837_8731ca8a8b6c45afb1c21e8d644fb998.pdf
    • https://cdn.shopify.com/s/files/1/0430/1327/5811/files/oxford_discover_5_workbook_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0435/2560/3488/files/the_expanse_reading_order.pdf
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/wetovatudumaxa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3689/2584/files/browser_app_video.pdf
    • https://cdn.shopify.com/s/files/1/0435/0607/3759/files/zimaje.pdf
    • https://cdn.shopify.com/s/files/1/0448/2259/3698/files/lowes_guntersville_al.pdf
    • https://cdn.shopify.com/s/files/1/0432/3826/0899/files/puxazuvexebuvog.pdf
    • https://cdn.shopify.com/s/files/1/0431/3340/3285/files/zeziwoposalewixezowovaxoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/4936/9252/files/arrestador_de_flama.pdf
    • https://cdn.shopify.com/s/files/1/0431/1800/2340/files/97084154128.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_off0000b698.bin
feaf5cece6cca7b120ecc4fb8ec41fef2ca42216d0f3af3c1055a05c468ad91c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB698 5396 bytes
font_01_sfnt_off0000c8d6.bin
a22ed07ce4d82bc3a2a5b126567d92655f20d012cfb5fb104adcc6f61b09d67b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D6 11096 bytes