Malicious PDF — malware analysis report

Static analysis result for SHA-256 801ba4b3be4681f1…

MALICIOUS

PDF

57.4 KB Created: 2020-08-30 02:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74364d6786ed824f014a5efadfc71d75 SHA-1: a5e20a9e2f05652873a82ebb33981d2b6c15db6b SHA-256: 801ba4b3be4681f1134925f6d30dc169b7f50dc122d2356e1bc98d56b4fcd742
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded links that redirect to a malicious URL, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text related to 'ketogene rezepte pdf' and a URL that appears to be part of a link farm designed to attract traffic. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL.

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/wix?keyword=ketogene+rezepte+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/99654190290.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/warhammer_40k_tyranids_8th_codex.pdf
    • https://cdn.shopify.com/s/files/1/0427/6987/5111/files/puleruwixu.pdf
    • https://cdn.shopify.com/s/files/1/0447/5600/9111/files/buteo_jamaicensis.pdf
    • https://cdn.shopify.com/s/files/1/0433/7916/3285/files/annexure_k_for_pf_transfer.pdf
    • https://static.usrfiles.com/ugd/cf79db_604261638ca0473e82ef8e7b234cee25.pdf
    • https://static.usrfiles.com/ugd/d2751c_53a1808b73f24316a4bfb29dc46cd2e8.pdf
    • https://static.usrfiles.com/ugd/b11f6d_c5fc4cfbb2ed4d218d41a99d2076b76e.pdf
    • https://static.usrfiles.com/ugd/b8c837_4bc0c6f527d74564a636a529e350350f.pdf
    • https://cdn.shopify.com/s/files/1/0433/5098/2805/files/java_collections_tutorialspoint.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5360/files/minority_scholarship_form_2020_18.pdf
    • https://cdn.shopify.com/s/files/1/0439/1659/1272/files/analog_to_digital_converter_ic.pdf
    • https://cdn.shopify.com/s/files/1/0450/4266/3582/files/wodalitimawolokajumilala.pdf
    • https://cdn.shopify.com/s/files/1/0437/0835/0615/files/anesthesia_types.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000979a.bin
98083156f8754e8225f7c1967ae43998af899c98e447c2d0058b95887e4840a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x979A 4808 bytes
font_01_sfnt_off0000a818.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA818 1800 bytes
font_02_sfnt_off0000b0a6.bin
0cb72efa97f724f1e5309bf284cbb70d03649cc6253310c59b6368a236fdde69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A6 11868 bytes

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