Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7336b936d7b902…

MALICIOUS

PDF

40.5 KB Created: 2020-09-08 07:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 475ab9f143726d989b4bd7fbca8f8903 SHA-1: 409e565cdd6db14ab68879acede73b1f0e990198 SHA-256: 5d7336b936d7b902ae0fec7a1b4c11d00845fe6ef0d3b30a719a967865eeea8b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed for SEO manipulation. One prominent link, 'https://ttraff.me/wix?keyword=autobiography+books+in+tamil+pdf', is identified as a malicious redirector. This suggests the document's primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, and the document body is heavily obfuscated.

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.me/wix?keyword=autobiography+books+in+tamil+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/aec2ea_795fe43d549741a68a58b39b13ea8451.pdf
    • https://static.usrfiles.com/ugd/374ce0_97b6123d96b04e4dbcba6e162c47de79.pdf
    • https://static.usrfiles.com/ugd/43d598_fed06cc0db97483884f2244fb09ccd68.pdf
    • https://static.usrfiles.com/ugd/1c8c1e_5d83020a4f41466892d368ee7577379c.pdf
    • https://static.usrfiles.com/ugd/0d9a50_a162ec9ff29b439e9876b57613ecb098.pdf
    • https://cdn.shopify.com/s/files/1/0449/9731/2676/files/phenol_chloroform_rna_extraction_principle.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/peraworot.pdf
    • https://cdn.shopify.com/s/files/1/0437/1028/3931/files/fogorore.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5682/files/dasemek.pdf
    • https://cdn.shopify.com/s/files/1/0429/3237/1622/files/42360661248.pdf
    • https://static.usrfiles.com/ugd/53cfc7_ebeaa6f8f7504e1b93107a954f016e68.pdf
    • https://static.usrfiles.com/ugd/ca9b0a_50652e9bde434618b15b21ea4fd3ace7.pdf
    • https://static.usrfiles.com/ugd/0e6328_54929c26f88d44a68744e40b8382d706.pdf
    • https://static.usrfiles.com/ugd/74e905_891c022f9d494b0596a90e5510351261.pdf
    • https://static.usrfiles.com/ugd/bae0a0_07d349bf0ac8430090793fade7f54a0e.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_off00006024.bin
ff554225d84f17f23f3a2587d062f989b342ea098a70d8512ea309cdd33caf34
pdf-font-stream PDF embedded font (sfnt) at offset 0x6024 5748 bytes
font_01_sfnt_off00007390.bin
e708a5c893bb846fe5fce7919acd30f1d80254e9df1bfcc57ec6f69a8cc011fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7390 9816 bytes