Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d905a762d253380…

MALICIOUS

PDF

41.4 KB Created: 2020-08-30 21:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bac5f2a796728a5e7fdc8e0e9ba1eef SHA-1: 7de4ae6f899011f81dbbd7649e3c16eb32181137 SHA-256: 2d905a762d253380138daa21296ab5af5407c0f9f2a7aa43eb33eb41260d57de
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.ru/wix?keyword=itext+convert+pdf+to+html', points to known malicious redirector infrastructure. The presence of this redirector suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery. The ML classifier also strongly indicated maliciousness.

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.ru/wix?keyword=itext+convert+pdf+to+html
    • https://cdn.shopify.com/s/files/1/0440/6594/7800/files/79891601956.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96056065099.pdf
    • https://cdn.shopify.com/s/files/1/0435/6171/3813/files/audit_number_on_tx_dl.pdf
    • https://cdn.shopify.com/s/files/1/0428/1715/9335/files/jebopoliribujiveduvolu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/85015248499.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/xikarutivumosesuketu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5868/3294/files/associative_property_of_addition_worksheets_grade_2.pdf
    • https://cdn.shopify.com/s/files/1/0437/4953/9989/files/saint_young_men_movie.pdf
    • https://cdn.shopify.com/s/files/1/0434/5587/3190/files/68209472611.pdf
    • https://cdn.shopify.com/s/files/1/0427/9821/9420/files/fupezufaxaguxodemanuwawo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/kozerubimatuk.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/noforagup.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_off000058aa.bin
36f28aa08ed5faf43717a9d6fba2fd8a1563a8d29b002b87c3709938d1ac9080
pdf-font-stream PDF embedded font (sfnt) at offset 0x58AA 5072 bytes
font_01_sfnt_off000069b5.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
pdf-font-stream PDF embedded font (sfnt) at offset 0x69B5 1800 bytes
font_02_sfnt_off00007242.bin
dfcd8a64c4deda5b7f55ede9939e8220977e475200be9a3083010ffb0a284027
pdf-font-stream PDF embedded font (sfnt) at offset 0x7242 11428 bytes