Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d3d7797b2b7f97…

MALICIOUS

PDF

78.6 KB Created: 2020-08-30 04:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06b1dba08aafab5b6e8f86f5504c445c SHA-1: 7d49aaf28590117278028213c9e5f252afe2b8fe SHA-256: 03d3d7797b2b7f97c5bd95d688d850f31ecd5a348bd530a1399c21823e1ba3f6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, characteristic of a link farm, with one of these links directing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be heavily obfuscated or corrupted, preventing a clear understanding of its specific lure.

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=pablo+escobar+facts
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/738632_46513b766b8e4919918dd610a4ffa452.pdf
    • https://static.usrfiles.com/ugd/b48b60_6eaf14bc46324714b1c4adb4b1897ecf.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c683f470e8d4d2c9afb00afbd6570fe.pdf
    • https://static.usrfiles.com/ugd/3f0e57_bc5f9ea88b2440ee955b7be9a28fd9e0.pdf
    • https://static.usrfiles.com/ugd/32acb1_13e48142419c48f894ddcc68c0c60970.pdf
    • https://static.usrfiles.com/ugd/bf650e_eb0b84741ec047cfaa2dd795f9900fd8.pdf
    • https://static.usrfiles.com/ugd/b8c837_d77a21b49db04cce8b30a19cc796e2bc.pdf
    • https://cdn.shopify.com/s/files/1/0454/1834/8712/files/polk_county_ledger_fishing_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/6055/1070/files/aflatoxin_in_ethiopia.pdf
    • https://cdn.shopify.com/s/files/1/0452/2721/2957/files/pamegukemanesupijob.pdf
    • https://cdn.shopify.com/s/files/1/0429/2263/9527/files/chapel_street_bars_broadsheet.pdf
    • https://static.usrfiles.com/ugd/0cd3a8_59ba8ad4a5834d6eafcf3a4775eaabb6.pdf
    • https://static.usrfiles.com/ugd/3f80ec_e4af0522f2c64d3ea9863b0ba59a8926.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f51f.bin
9dcd4fe4dfec4c988636ca547fcc5bba9c567ebfa9a75d81cc96289ed53ba950
pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 5016 bytes
font_01_sfnt_off00010633.bin
96609ea28e20a8b1f52e9c2897cb6957f5795ae1da01ae47b3d811c71fc9d8f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10633 11944 bytes