Malicious PDF — malware analysis report

Static analysis result for SHA-256 6577142aa126e730…

MALICIOUS

PDF

39.9 KB Created: 2020-08-31 05:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 533bcf51da124f21ac1aff9d10cfbbfb SHA-1: e4075910e20c7bd68b54f292ca2d1381189ca9ca SHA-256: 6577142aa126e73081f2c531e9202f0707ef5f5133531f928ff821083fdd7d0d
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the malicious redirector and the link farm suggests an attempt to lure users to malicious sites or host malicious files.

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.com/wix?keyword=marks+linda+pastan
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9051/7917/files/hack_wifi_wps_android_apk.pdf
    • https://cdn.shopify.com/s/files/1/0445/4989/8399/files/autobiography_books_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/9246/7109/files/99721297576.pdf
    • https://static.usrfiles.com/ugd/b5472a_78a4a79bea4b4ae599f16e9f4dc53ef0.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0f184f9bf4349768a38ab38577e1672.pdf
    • https://static.usrfiles.com/ugd/dcfb95_01bba65b9a2b419d8ca130af5a5ff1bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_dbdd8039c4d94a20a1dacf8571ad8fef.pdf
    • https://static.usrfiles.com/ugd/eda9ba_d4f1f655c8704641bd767d83de5fa930.pdf
    • https://static.usrfiles.com/ugd/de65f7_c3fb1f0dc97540dc87775f172ee86cb7.pdf
    • https://cdn.shopify.com/s/files/1/0430/6678/5949/files/22358972168.pdf
    • https://cdn.shopify.com/s/files/1/0430/3149/4810/files/varolavutulelivarabumidir.pdf
    • https://cdn.shopify.com/s/files/1/0434/5135/1200/files/bust_your_windows_glee.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_off00005f47.bin
553084cf9ca20707a154afccd9123556ee5f76ae38b7ccb31aa48e149cef548c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F47 5020 bytes
font_01_sfnt_off0000706a.bin
1f0baa6bd1740c0474fedaf2ac78001c4b7caf4dd87ffc78f164f4bb2cf83c90
pdf-font-stream PDF embedded font (sfnt) at offset 0x706A 9828 bytes