Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab4397fc665c204…

MALICIOUS

PDF

46.9 KB Created: 2020-08-30 11:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f167889fafdfa0ea3de2944d1824a3b0 SHA-1: e79ceee5ad41d80965337f883a31b01940219835 SHA-256: aab4397fc665c204f20739128fa7a7ad00491a2911fa2201c24d47b95aa734ba
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, many of which point to external PDF files hosted on static.usrfiles.com, forming a link farm. One critical heuristic identified a link to a known malicious redirector at https://ttraff.cc/wix?keyword=nvidia+quadro+p1000+review. This suggests the document is designed to lure users into clicking malicious links, likely for phishing or malware distribution.

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=nvidia+quadro+p1000+review
    • https://static.usrfiles.com/ugd/735189_d0b9cded1e044c82857c0c28d265cce4.pdf
    • https://static.usrfiles.com/ugd/2f07a1_c3a5191bd36e42f2a6af1bfdbdbd3d60.pdf
    • https://static.usrfiles.com/ugd/0049ca_8df5e5d50b8e43529ce07af320869412.pdf
    • https://static.usrfiles.com/ugd/dc98cc_b7895f63b34f49e9891a8b5adf47b1ee.pdf
    • https://static.usrfiles.com/ugd/760101_0ff766f44db146fcaeacaab2250a4cb1.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_03f35367e6424dfcb2e429cf9a8c552f.pdf
    • https://static.usrfiles.com/ugd/b8c837_2977d4f4b08f41228e7cb93640987667.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4f4ad8a7f1045a68f72f7509879d609.pdf
    • https://static.usrfiles.com/ugd/cdb50c_29de0279c1984a08b4ff095b831a11a2.pdf
    • https://static.usrfiles.com/ugd/5af86b_40c73ded89404b038bd7fdbcca8a8db5.pdf
    • https://static.usrfiles.com/ugd/accd1f_d80731837a1f475fb3085094b54e67ff.pdf
    • https://static.usrfiles.com/ugd/77eba6_58c04cf83b37480dbb73b373665a0ff4.pdf
    • https://static.usrfiles.com/ugd/6924eb_b3accdee2eea4e50b0732c0fb00c827b.pdf
    • https://static.usrfiles.com/ugd/10a4aa_b8b66257e10848e2a40f64d5569c3664.pdf
    • https://cdn.shopify.com/s/files/1/0433/9849/6412/files/44381751748.pdf
    • https://cdn.shopify.com/s/files/1/0431/1882/1530/files/introduction_to_protein_structure.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a1c.bin
074b7f175a1c81100e0568fd08906e22d5b7c1ebe052249e12b0e3b11d40edf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A1C 4880 bytes
font_01_sfnt_off00007ad7.bin
2377501146582c4dd2a027111e01da2bb5c7b806710b89f564542dc4d59711e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD7 11228 bytes
font_02_sfnt_off0000a0b3.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0B3 4324 bytes

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