Malicious PDF — malware analysis report

Static analysis result for SHA-256 579e7faf29e1d237…

MALICIOUS

PDF

41.6 KB Created: 2020-08-31 02:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e7410ebee41794939b6aad24a9db56e SHA-1: 60e74b94c83c8d639e2379aab7890aca9ee4d9df SHA-256: 579e7faf29e1d237de983d2dd297e8199b76637e6661d84eb5b0732c7b6e71da
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 one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious redirector URL and a reference to 'Pantech element rom', suggesting a lure or keyword stuffing for SEO manipulation. The primary attack pattern involves leveraging these links for redirection or SEO poisoning.

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=pantech+element+rom
    • https://static.usrfiles.com/ugd/b8c837_f013975460c145c08db98c5e7f6d1d76.pdf
    • https://static.usrfiles.com/ugd/eaf48f_190acbb82eac498386465b418d22fd8d.pdf
    • https://static.usrfiles.com/ugd/7598fa_5111f1886d5c47aa9cc730df1a2b9bce.pdf
    • https://static.usrfiles.com/ugd/516574_68d2709796eb45759e8b01a5d0fc65b6.pdf
    • https://static.usrfiles.com/ugd/60933b_da0b65b6bf214bf4bb46e13bfeb6fb99.pdf
    • https://static.usrfiles.com/ugd/32acb1_4a9291e564214f9c9fe746971a58e0c8.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/xinawopog.pdf
    • https://cdn.shopify.com/s/files/1/0430/1229/2767/files/pan_enteral_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0440/3278/6597/files/98833111523.pdf
    • https://static.usrfiles.com/ugd/b7082a_a45124e9baa14c568287dbb24c9fe548.pdf
    • https://static.usrfiles.com/ugd/1ee69b_e491e1c68c4a4d4faaadfc79f8550953.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_off00006591.bin
85325a3235a022a57f672d7f2b0638f60252b4251fd8bfa7cb7eaa6c4def75c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6591 4864 bytes
font_01_sfnt_off000075e3.bin
1dd2f60138b261dab1516327b796e7518174e45dd6c1c06fe779ddfab3d64683		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75E3 10732 bytes

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