Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a195109ddb74c5…

MALICIOUS

PDF

44.5 KB Created: 2020-08-29 01:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31265693ac8076a821ac7bccb9264918 SHA-1: cf4f211d80a0039661bba302152f115cc6af9989 SHA-256: 74a195109ddb74c5031d35bc9b7adc22eec4daa4925fe85e5647e2fbf8c2020b
154 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.cc/wix?keyword=resignation+letter+in+bangla+font. The document body, though heavily obfuscated, contains this URL and other benign-looking PDF links, suggesting a link farm or redirection tactic. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to click the malicious link.

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=resignation+letter+in+bangla+font
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_bd304fa80b284c0da156ffa63fbaaa78.pdf
    • https://static.usrfiles.com/ugd/b8c837_52db3154e7c3442d9f3b20996c601b15.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce34b69915f945f9996a0bdff8cedec7.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce25419a61c74557bba30b2c99e307f3.pdf
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/zerul.pdf
    • https://cdn.shopify.com/s/files/1/0430/2091/0746/files/96571586847.pdf
    • https://cdn.shopify.com/s/files/1/0462/6762/9730/files/zeloboxepigewajamup.pdf
    • https://static.usrfiles.com/ugd/b8c837_affe1b30498c467f87c4f69187cf9570.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd2eee70ff68435f8f69e24793e08da0.pdf
    • https://static.usrfiles.com/ugd/b8c837_150f3557ebb9460486fd6a6afa461a1e.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d3eb8c9cf294477bd1a2e232c109eff.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5f0b8d127c7440aa11bdf2ae9256a3a.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca8b31c9d3a34512a3594702ac7bedb0.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_off000070b9.bin
e75cfdd2898192f5461a9a16c41b6b49db35c86359f9c8354a134ba1e491ada5
pdf-font-stream PDF embedded font (sfnt) at offset 0x70B9 5080 bytes
font_01_sfnt_off00008211.bin
f8a93f5458c5c20b4447d550f20fe6b57e3d6c667fe38dea8b6edd2e59117394
pdf-font-stream PDF embedded font (sfnt) at offset 0x8211 10236 bytes