Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b546b6b68f955c3…

MALICIOUS

PDF

48.5 KB Created: 2020-09-07 01:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 177f9d43b0aac7eaef70004b87bc2a4f SHA-1: 692793463024bf268a2894dd2626a3156cc1b604 SHA-256: 7b546b6b68f955c31600b8276556129ecacf3e7ee7d64e4ccf2fc32b5f89c87d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.club/wix?keyword=wondershare+filmora++with+key'. This URL is likely part of a phishing or SEO poisoning campaign, aiming to redirect users to malicious content. The presence of numerous other external PDF links further supports the SEO poisoning hypothesis. The ML classifier also strongly indicated maliciousness.

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.club/wix?keyword=wondershare+filmora++with+key
    • https://static.usrfiles.com/ugd/4bdc6d_6df8ffe9833841fbaff59d7e984ab82b.pdf
    • https://static.usrfiles.com/ugd/cd81e9_a0c19064b3424d0dad34526c5d192df0.pdf
    • https://static.usrfiles.com/ugd/136d07_a27238930ba549889b35257eec7934e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_85251ad486794e26b62a980bd3aacaf1.pdf
    • https://static.usrfiles.com/ugd/f1780b_b9c71071fbde4fa2bd6e4e39d1e7df77.pdf
    • https://cdn.shopify.com/s/files/1/0433/9499/0243/files/difference_between_phonetics_and_phonology_examples.pdf
    • https://cdn.shopify.com/s/files/1/0430/8310/4409/files/75115823226.pdf
    • https://cdn.shopify.com/s/files/1/0432/8574/1724/files/advanced_diploma_in_information_technology_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0435/4405/1871/files/ancient_greek_literature_and_society.pdf
    • https://cdn.shopify.com/s/files/1/0454/0337/3736/files/vawoz.pdf
    • https://static.usrfiles.com/ugd/44b221_68935aa95206434186b9960038ac310a.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_eb3803082174467caaeac2605e08f5c7.pdf
    • https://static.usrfiles.com/ugd/11baf9_42b74e88877d4991a0d79c9c883c911c.pdf
    • https://static.usrfiles.com/ugd/ea2f88_0dcd8e3dac6a4061bb3a286e1ad1eaca.pdf
    • https://static.usrfiles.com/ugd/3649d2_fbe259997350458fbaf0570c0b433284.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a498d95f1c549b0a84515fce544a631.pdf
    • https://static.usrfiles.com/ugd/b8c837_0615030b34e94baab4a6cb96bc143ad6.pdf
    • https://static.usrfiles.com/ugd/15ebe2_2f76325d64324c6ca3fe869558ac9697.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/
    • https://cdn.shopify.com/s/files/1/0433/9499/0243/files/difference_between_phon

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007228.bin
c3ea29c1be791f7bedb0ad911dd07f839f2339e547d4da8496259d3f7e28d6ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7228 5416 bytes
font_01_sfnt_off0000848a.bin
00fa577aa35a2ae0012f9029f32e537ed3f36e1cce461e996e6ab98ef2a7ebc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x848A 15372 bytes

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