Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a138042047afcd…

MALICIOUS

PDF

45.7 KB Created: 2020-08-29 09:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d2446f93176f574544e1fb166182cbf SHA-1: c6f78f897ebac2a1d7c67112b2c4257d39251f96 SHA-256: 73a138042047afcdebdf25fa82fa377cb9dfbf06fbd9d88243d724b7e99140c5
194 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as a worksheet. It also exhibits characteristics of an SEO link farm, embedding numerous links to other PDFs, likely to manipulate search engine results. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs and the redirector link suggest a phishing or spam campaign aiming to lead users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.com/wix?keyword=area+of+complex+figures+worksheet+6t
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0601/7186/files/nizazixasak.pdf
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/59384116782.pdf
    • https://cdn.shopify.com/s/files/1/0430/5797/1354/files/demisetaki.pdf
    • https://static.usrfiles.com/ugd/b8c837_ccdd99dee19742eaaccc7bd74fa3b04f.pdf
    • https://static.usrfiles.com/ugd/b8c837_68c449a8f5514fd8bdec4b1be8db192b.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f1c85de66dd4687b694c5f26e3a0ccd.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1271/files/biology_practical_book_class_12_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0427/6905/5911/files/93185138942.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9475/files/pis_yedili_bertan_asllani_fragomen_i.pdf
    • https://cdn.shopify.com/s/files/1/0428/6555/7670/files/bhagavad_gita_in_tamil_with_meaning_free_download.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf4e2112fc7b43eb9c477857facdc4b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_529e85e8eafa4c27acd767bef33f89b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_95797f8b807143c5af5fd41e7d5949e8.pdf
    • https://static.usrfiles.com/ugd/b8c837_70c57db51c4244df93590711178b9b6b.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_off0000634f.bin
74820da5310c5d723a4bb59edad41d904198a27951b5a47806fa2ca4873a3e67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x634F 5796 bytes
font_01_sfnt_off00007706.bin
df31d0721d9ccc64fa458758a5cf340e96e4d564b9cd78d55cb1d2c3f72fd953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7706 15696 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.