Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1c79d8fbe831d7…

MALICIOUS

PDF

105.6 KB Created: 2020-08-29 08:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b2fdf6d537aefe6ef76c9d48cc22cb0 SHA-1: b70e32bdd29f27812304a62e7a207492c6f2e9fd SHA-256: ab1c79d8fbe831d7428db156c28b58378f520944e1bb25c6278ba18800de212c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The PDF also exhibits characteristics of a link farm, with numerous external links, many hosted on 'static.usrfiles.com'. The ML classifier strongly indicates maliciousness. No scripts were extracted, limiting the analysis of specific execution behaviors.

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=leed+reference+guide+for+neighborhood+development
    • https://static.usrfiles.com/ugd/b8c837_f6d0bd0993cd48fd8b679ad36d2fa732.pdf
    • https://static.usrfiles.com/ugd/b8c837_f49eabad86f048a197efaeb994fdb866.pdf
    • https://static.usrfiles.com/ugd/b8c837_87138a1d72a24928a626ab6d5ac58bec.pdf
    • https://static.usrfiles.com/ugd/b8c837_03469f8f1a1c4133900d943862dac300.pdf
    • https://static.usrfiles.com/ugd/b8c837_6938b56e0ada4c10b1e4f861b6c83288.pdf
    • https://static.usrfiles.com/ugd/b8c837_59741ccce1674485acd68ab77f7d4372.pdf
    • https://static.usrfiles.com/ugd/b8c837_1123d16fb5c3423fabb5776607bda751.pdf
    • https://cdn.shopify.com/s/files/1/0457/8849/6038/files/alienware_aurora_r5_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/9480/1568/files/jovowelanevatawu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/zawobaket.pdf
    • https://cdn.shopify.com/s/files/1/0438/4007/7981/files/nawiwefuw.pdf
    • https://cdn.shopify.com/s/files/1/0429/7854/1722/files/inventory_sales_report_template.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001629d.bin
161b4e0f26d4b02b739dd5f1d103c275bb3698404bcf1b60ba7140057019f315
pdf-font-stream PDF embedded font (sfnt) at offset 0x1629D 5320 bytes
font_01_sfnt_off0001748b.bin
c1c67c2c32b2c5723067b31903fd0ffda957eafb45554129b2dd3719691415a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1748B 10848 bytes