Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2c0337fc842be4…

MALICIOUS

PDF

31.9 KB Created: 2020-09-02 00:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb82eb18b5166ddc2ff48a3694fe0b38 SHA-1: 20bc150878528859bd6f13faf96f6a7dec8c4d76 SHA-256: 6f2c0337fc842be47819503070c18a63c38a43a3b6769c31a18cbba200247d6d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to disguise the link's true destination. The presence of many Shopify links suggests a link farm used to obscure the primary malicious destination.

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=cartoon+video+shiva
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5177/7185/files/tudezilifipexi.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/net_gear_wpn824.pdf
    • https://cdn.shopify.com/s/files/1/0435/8940/2779/files/9140447646.pdf
    • https://cdn.shopify.com/s/files/1/0434/9201/6280/files/tibufefibiborakipeka.pdf
    • https://cdn.shopify.com/s/files/1/0428/9747/3699/files/leadership_and_self_deception_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/9819/3566/files/vazitun.pdf
    • https://cdn.shopify.com/s/files/1/0429/3663/1452/files/metijaruxanamuxaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/4357/7246/files/wupiganebuloge.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/ketenunojedovo.pdf
    • https://static.usrfiles.com/ugd/b8c837_af90e20f444e4385837840cf9242fc11.pdf
    • https://static.usrfiles.com/ugd/3d0627_c1956a193f2a43ec823bf84b7db9985b.pdf
    • https://static.usrfiles.com/ugd/b0cd75_32cf06d108834489a3a08a8540ac271b.pdf
    • https://static.usrfiles.com/ugd/b8c837_05541944863e4a8cb301cb6a7e10482f.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_off000043af.bin
f6bf006c9ff70a71e0e08de06e01efb2b69035166ab0c95c62de260390143d5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x43AF 4844 bytes
font_01_sfnt_off00005420.bin
8d7dc983c360bd841c240d6b5adb8552146c4409f0f4a9267994b1b0e28d6748
pdf-font-stream PDF embedded font (sfnt) at offset 0x5420 9056 bytes