Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92da9d774f6bd78…

MALICIOUS

PDF

41.2 KB Created: 2020-08-03 10:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ccff567c869ed444c690adfd4a7a581 SHA-1: 560f54474db3c2c4782814265cdae34fef025efd SHA-256: e92da9d774f6bd7821af14375a9e6abeec2766d15a2022243a6e94a59c2b75e3
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing indicating a link to a known malicious redirector at 'https://ttraff.cc/pify?keyword=anime+group+of+friends'. The document body, though heavily obfuscated, also contains this URL and numerous other links pointing to PDF files hosted on Shopify. This suggests a link farm or redirection strategy to distribute malicious content or phishing pages.

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=anime+group+of+friends
    • http://files.leonkew.com/uploads/1/3/2/6/132680869/xewavoxaponorexatugi.pdf
    • http://files.utahflightinstructor.com/uploads/1/3/0/7/130738596/85c25d6f84a19.pdf
    • http://files.annestorno.com/uploads/1/3/0/7/130739452/fuginow_fepofibiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1634/files/46005315424.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/damufezeloge.pdf
    • https://cdn.shopify.com/s/files/1/0437/7051/1521/files/67810611858.pdf
    • https://cdn.shopify.com/s/files/1/0433/8712/5927/files/37746506458.pdf
    • https://cdn.shopify.com/s/files/1/0432/4445/4051/files/xodidatelizukat.pdf
    • https://cdn.shopify.com/s/files/1/0431/1282/4986/files/tsi_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/4874/7676/files/sawodipututuzodopusi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2906/files/74718190725.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21659337375.pdf
    • https://cdn.shopify.com/s/files/1/0437/2588/1498/files/18274650525.pdf
    • https://cdn.shopify.com/s/files/1/0434/4011/1782/files/75389140190.pdf
    • https://cdn.shopify.com/s/files/1/0438/9430/9019/files/9908899908.pdf
    • https://cdn.shopify.com/s/files/1/0431/7147/9713/files/67350756264.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_off000064c0.bin
2901e5958913ceee4f51e920158971b629ada0c8e1f43a1802af2baabc8946c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x64C0 5108 bytes
font_01_sfnt_off00007615.bin
13acfe5869d693c118acda10dbdb7bcc2c4620b7d9ef69ab0ca63b97e1fbe8c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7615 9996 bytes