Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3b3878cb51a47d…

MALICIOUS

PDF

42.8 KB Created: 2020-09-09 12:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0178e16fc0c099326537a241f86eaa82 SHA-1: 68e6033d95816c4fa68409691bc8fe55eb4096ff SHA-256: 7e3b3878cb51a47d2d531899a7e5e3abea66f60156279f1ee0008b3a45ec1e5f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, includes the same malicious URL and appears to be a lure related to 'sketsa gambar burung hantu'. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic to distribute malicious content.

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=sketsa+gambar+burung+hantu
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/f9fac6_2bc121786787485e8ecad8d6996605ce.pdf
    • https://static.usrfiles.com/ugd/1479de_994b6e3529024d25bb8a00764e29e664.pdf
    • https://static.usrfiles.com/ugd/dd4472_7f4b623bd9344b30a0255d6959699c13.pdf
    • https://static.usrfiles.com/ugd/162fe6_942c37923c19450fb29d73f914111b65.pdf
    • https://static.usrfiles.com/ugd/353d00_15798decbf2e491ca89a607cace66bfb.pdf
    • https://static.usrfiles.com/ugd/9d869b_e0778974e6d14fea9becc8a07e7406fa.pdf
    • https://static.usrfiles.com/ugd/a374b9_b7b36410598c4ace8c18b4ef0c6b276d.pdf
    • https://static.usrfiles.com/ugd/516574_f131db0e7fa847a3ad698c0ae0443f3a.pdf
    • https://static.usrfiles.com/ugd/031dda_11ca6d1955f74b32b2d6d1ca0485ef19.pdf
    • https://cdn.shopify.com/s/files/1/0439/6387/5486/files/aocs_methods.pdf
    • https://cdn.shopify.com/s/files/1/0446/8667/2025/files/python_programming_language_full.pdf
    • https://cdn.shopify.com/s/files/1/0433/9938/1157/files/bamirapunozora.pdf
    • https://cdn.shopify.com/s/files/1/0429/7090/6780/files/87393668322.pdf
    • https://cdn.shopify.com/s/files/1/0440/7335/3381/files/16149286113.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5941/files/rigirilojexuxijekibinubad.pdf
    • https://cdn.shopify.com/s/files/1/0436/7292/8409/files/37330301898.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a76.bin
cba506c4201c9d7c42e5bef406966baf8c6234906178337ad7f05aa79fa4279c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A76 5376 bytes
font_01_sfnt_off00007c92.bin
a6b0d6b974fd28173a630a53fce9b33458b47f4fc1ede44e4f47f9971ba42667
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C92 9876 bytes