Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd465d2baf5eeea…

MALICIOUS

PDF

57.2 KB Created: 2020-08-31 20:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57b267b44a847a85f6e6c135416c8436 SHA-1: 18c8a51cbd682503a3612afaf78ab94c78613b4b SHA-256: 5fd465d2baf5eeea8be862d3332d137e7c3f0a2aa333e0b5b757d6ec002fc9a3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the primary goal is to redirect the user to malicious infrastructure, likely for further exploitation or phishing. The presence of a large number of external PDF links also indicates a link farm, potentially for SEO manipulation or to host further malicious content.

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/pify?keyword=stay+with+me+korean+video+song
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/c618e9_2eb8ded48fa4478389a8ed34096844b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ba8fa64ff2146f39c01d83a7ed68bbf.pdf
    • https://static.usrfiles.com/ugd/d162e3_a0cfa4d2c06e41f697590fa44df0946d.pdf
    • https://static.usrfiles.com/ugd/b8c837_10c165ccca2648dea3ce9a573b0be4fb.pdf
    • https://cdn.shopify.com/s/files/1/0436/3350/8512/files/free_rack_card_brochure_templates.pdf
    • https://cdn.shopify.com/s/files/1/0438/1271/6704/files/voltage_controlled_oscillator_using_ic_566.pdf
    • https://cdn.shopify.com/s/files/1/0449/0684/0231/files/73927891472.pdf
    • https://static.usrfiles.com/ugd/7f929b_4fd5996952e84d78beb6dacd82dee3d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_56a55d44d62a4731ad5ed01b4f256b52.pdf
    • https://cdn.shopify.com/s/files/1/0437/7283/8039/files/lalixonulex.pdf
    • https://cdn.shopify.com/s/files/1/0433/3735/1323/files/zujuni.pdf
    • https://cdn.shopify.com/s/files/1/0432/6762/1028/files/xodagenixumogenufadobar.pdf
    • https://cdn.shopify.com/s/files/1/0434/0688/5031/files/vuxodageguni.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_off00006855.bin
5ea9bff5688764b46eb9dd9a1ef48bb8fc89e776aa6c14b31fa1ff61c5b6a01d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6855 18152 bytes
font_01_sfnt_off0000a193.bin
0f5424d42992d83ef698e69720b668b1928df72ae5b2e8148dc8bc067840d548		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA193 5628 bytes
font_02_sfnt_off0000b4a2.bin
b7b1f350d87608d4e55178afb5343c965f4b0b546833893b42e72f4c8d5930df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A2 10364 bytes

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