Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbadfc24b3c52e34…

MALICIOUS

PDF

48.7 KB Created: 2020-08-31 11:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33fe9e68cc94e1edc7e2afe284fae0a3 SHA-1: 51f649401ec990f41a4e49ac8e26cfa866bf7496 SHA-256: fbadfc24b3c52e3427f06118d91f9c0ed4d6c15b007dfa64b3e4823fa9c31da3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=parson+brown+orange+tree+for+sale'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on shopify.com. The ML classifier also strongly indicated maliciousness. The embedded content, though heavily obfuscated, appears to contain URLs that align with the redirector and link farm findings.

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=parson+brown+orange+tree+for+sale
    • https://cdn.shopify.com/s/files/1/0436/0539/3571/files/geometry_common_core_pearson.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/the_birth_of_african_american_culture.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/99203043279.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7922/files/28583966457.pdf
    • https://cdn.shopify.com/s/files/1/0431/3684/3933/files/98986833498.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/udemy_certificate.pdf
    • https://cdn.shopify.com/s/files/1/0429/0579/6774/files/66542288832.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/35092555467.pdf
    • https://cdn.shopify.com/s/files/1/0431/4470/8245/files/tulumu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7746/0383/files/the_saint_of_incipient_insanities.pdf
    • https://cdn.shopify.com/s/files/1/0434/3742/4807/files/atom_linux_mint.pdf
    • https://cdn.shopify.com/s/files/1/0440/2230/0822/files/bagenurodigetekamul.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/custom_team_uniforms_near_me.pdf
    • https://static.usrfiles.com/ugd/b88e3d_2c51cb987fb64eb3a3b2026ced5d3e49.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e4e60300a364766892853ec9bd7eabb.pdf
    • https://static.usrfiles.com/ugd/432b07_dfdf80eb1bfe47a1b57be4d76f1ca5e5.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062f4.bin
7fa4f1275080e71e9c7307ce4c0bf18ffdd5db95d6f13715d9d9bb611da87df2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F4 4908 bytes
font_01_sfnt_off000073b4.bin
cb159cc9d714520fdf604515834a8e5d6ccdf81551317d8133b939af7313f940		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B4 6068 bytes
font_02_sfnt_off00008364.bin
8aa1ee813aa5d42f9c8a066cb86ce53547863b99281f9368f9affa311da6358c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8364 10424 bytes
font_03_sfnt_off0000a70e.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA70E 4324 bytes

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