Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f1cdb901ae4543…

MALICIOUS

PDF

61.2 KB Created: 2020-09-01 15:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19b0b7ddbc11c3a27ae66657546499cb SHA-1: a9e5c2c9f0e3aecd721994b3b79c357f09907fbd SHA-256: 18f1cdb901ae4543cd38e613eeb6fa74eb3cc8779ed60259cb27655f19c6c991
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a link farm, with the primary link directing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same malicious URL and references to benign-looking content, likely a lure. The presence of numerous external PDF links suggests an attempt to distribute further malicious content or engage in SEO manipulation for malicious purposes.

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=ap+cm+jagan+songs
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/fasenuzoxewo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4835/2406/files/podipuvidavi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99237037604.pdf
    • https://static.usrfiles.com/ugd/516793_276362e712d44d1791b93287b86debfe.pdf
    • https://static.usrfiles.com/ugd/735189_b939d6057196494ab2bdc7104291c47c.pdf
    • https://static.usrfiles.com/ugd/f0e51d_b99cb5ed4a0547258f9d2a0e83bf5ff3.pdf
    • https://static.usrfiles.com/ugd/b8c837_dc75acbff4444436856a2d8a458f12a5.pdf
    • https://static.usrfiles.com/ugd/451461_d78d903b9c9d4bc3b8fa2e44472d5fd0.pdf
    • https://static.usrfiles.com/ugd/b8c837_9acd4a48cc8e4e84a570bd63d510f73d.pdf
    • https://static.usrfiles.com/ugd/b8c837_59de6ac12912479a83686689179d656e.pdf
    • https://static.usrfiles.com/ugd/64f9d2_24e49c2cbaf54c11ac430df8ac14ae1b.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c23bbcad5fd420c9bd99cf0bb1640e2.pdf
    • https://static.usrfiles.com/ugd/ceb2e8_fc1eda283a554064b4fef4b6c519b94d.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000605f.bin
f41757998e04c56868b03c3fb8f4e350af44afbdd07c11c8555ff0229ca610ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x605F 5188 bytes
font_01_sfnt_off000071ff.bin
35c4f08ba34d20cfe4f8f562abf4d58f4acae73c2b8f08a518e27b8347ae2184		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71FF 26844 bytes
font_02_sfnt_off0000ac54.bin
37951c95ae41467dbd7ab28315e221054376ac27162f4876378553e7929609db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC54 10876 bytes
font_03_sfnt_off0000d0de.bin
41fdc7529d585b87f0f21921734f16b25a46134c20ce1e87f08b37d5a199f2b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DE 16568 bytes

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