Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6b8eb0f73f08b0…

MALICIOUS

PDF

50.0 KB Created: 2020-08-22 10:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2452480a63356d46b70861aa024af6ce SHA-1: d7443f6fd4155ec63db240238c0ec5887ca64060 SHA-256: 3a6b8eb0f73f08b0c1e03d8aa7765ae33c0cb4a6ba2ce1fa0ce40f275d588850
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same redirect URL and a search query related to Windows support software, suggesting a lure. The PDF also hosts a large number of external links, many pointing to benign Shopify PDFs, likely as part of an SEO link farm to obscure the malicious redirector.

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=where+does+bootcamp++windows+support+software
    • http://files.msbes.com/uploads/1/3/0/8/130815115/141045.pdf
    • https://cdn.shopify.com/s/files/1/0433/7552/6051/files/etymology_english_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0432/6191/9390/files/2007_lexus_is_250_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8971/files/zibixut.pdf
    • https://cdn.shopify.com/s/files/1/0435/2249/0532/files/cuento_de_la_bella_y_la_bestia_corto.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6238/files/63344615283.pdf
    • https://cdn.shopify.com/s/files/1/0430/2556/3799/files/kesolilaselerigotulanov.pdf
    • https://cdn.shopify.com/s/files/1/0434/4256/9383/files/booker_t_washington_biography.pdf
    • https://cdn.shopify.com/s/files/1/0437/3564/6357/files/21912557281.pdf
    • https://cdn.shopify.com/s/files/1/0431/7439/6063/files/xigovubaf.pdf
    • https://cdn.shopify.com/s/files/1/0435/8209/5517/files/fisher_yates_shuffle_java.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_off00006f7f.bin
110681aa713d5fb00261d6f78b9f849aebed83f230d4857c630985624e3fd8e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7F 5608 bytes
font_01_sfnt_off00008287.bin
d131d6989357d58ae144d9f912d23ece6c3d0e4de599aa0d5f61440c359c60b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x8287 10376 bytes
font_02_sfnt_off0000a633.bin
c0a2658b41d639f606eba7091e87e8bd42a81d8ac063310e149400b84daa429e
pdf-font-stream PDF embedded font (sfnt) at offset 0xA633 16092 bytes