Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb82676e20a4f5a…

MALICIOUS

PDF

44.5 KB Created: 2020-08-30 22:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 166c6117382da4b77bc1f066624a4c31 SHA-1: 038584c141f1ef42af929c69f53031c1c4a4f9d8 SHA-256: 9eb82676e20a4f5a2fed4ef10c0e029f3b50dbc1dd98901a0a3a62439c36ca4e
154 Risk Score

Malware Insights

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

The PDF file contains a malicious redirector link disguised as content about 'Como sacar los numeros cuanticos'. The ML classifier strongly indicated maliciousness, and the PDF was flagged for containing a mass external PDF link farm, with one primary malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and several benign-looking Shopify URLs, likely part of the link farm.

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=como+sacar+los+numeros+cuanticos
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54729765263.pdf
    • https://cdn.shopify.com/s/files/1/0434/9424/4516/files/sobapidoxokixokewiku.pdf
    • https://cdn.shopify.com/s/files/1/0430/3929/3593/files/rodabiluferosixolex.pdf
    • https://cdn.shopify.com/s/files/1/0449/5494/3647/files/10731764622.pdf
    • https://cdn.shopify.com/s/files/1/0462/7169/2951/files/vocabulary_for_high_school_students.pdf
    • https://cdn.shopify.com/s/files/1/0429/5009/9107/files/8010663821.pdf
    • https://cdn.shopify.com/s/files/1/0434/0069/1866/files/24423098952.pdf
    • https://cdn.shopify.com/s/files/1/0435/5869/9159/files/nds_emulator_android_apk_2019.pdf
    • https://static.usrfiles.com/ugd/3bca44_6fcd2d3d8c7248fe90ec7693a65421db.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6a6978593d34cf9a289c5df23707cec.pdf
    • https://static.usrfiles.com/ugd/b8c837_789b67d666bf4959a7013fb3584f0a42.pdf
    • https://static.usrfiles.com/ugd/b8c837_97576efa759d4dea8604a39c453731cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca5af8255dab4f77b418bf4e95e8d011.pdf
    • https://static.usrfiles.com/ugd/7d1dc9_6e0d13f3c84c43de9b0c318747af234c.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ee1cf382a9e47acaf634a3dbb58835d.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_off00007008.bin
085a1e8798481370321286de0ce400f807f71bb871423303d44aac10189b0f8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7008 4848 bytes
font_01_sfnt_off00008064.bin
3a1f74d902a89489b5b9b49c2e56d3989033751b23266a452c6a387d5ff339aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x8064 10836 bytes