Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a8d63bceaf460c…

MALICIOUS

PDF

40.4 KB Created: 2020-08-29 04:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d849ede7bccd961e57c9ac5a47094534 SHA-1: af0c5f3c1d038c59573678085df37c58367283e7 SHA-256: 90a8d63bceaf460ccf82fc8d1aacd623a858336d90ef974e43d42959d7740632
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a lure for a "qnap surveillance station license hack". The document body, though heavily obfuscated, also contains this URL. The presence of a mass external PDF link farm suggests a SEO poisoning or spamming campaign to distribute malicious content.

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=qnap+surveillance+station+license+hack
    • https://cdn.shopify.com/s/files/1/0444/2639/5814/files/lord_kannan_songs_in_tamil_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/9026/4742/files/92329317239.pdf
    • https://cdn.shopify.com/s/files/1/0450/8162/4739/files/buxopabikig.pdf
    • https://static.usrfiles.com/ugd/b8c837_17843f1b74f547aab2b79d085ca6893f.pdf
    • https://cdn.shopify.com/s/files/1/0434/3070/7356/files/90678002701.pdf
    • https://cdn.shopify.com/s/files/1/0434/6901/3158/files/megaman_zero_3.pdf
    • https://cdn.shopify.com/s/files/1/0433/9626/8193/files/83574371621.pdf
    • https://cdn.shopify.com/s/files/1/0432/0722/9597/files/appetite_contrast_font_free.pdf
    • https://cdn.shopify.com/s/files/1/0439/8628/8798/files/kidafenolanuduselajigegob.pdf
    • https://cdn.shopify.com/s/files/1/0437/5543/8234/files/xaganezufevolasar.pdf
    • https://cdn.shopify.com/s/files/1/0447/7750/4925/files/attack_deoxys_solo_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/2560/3488/files/catia_machining_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0432/7528/8732/files/pdf_viewer_toolbar_missing.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_off00005f2f.bin
b28c6ed8abaa3dfc5a2277e4d69d835ae3dcab34799ad3b4001dca12149f58b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2F 5204 bytes
font_01_sfnt_off000070da.bin
2b6edeb164235e3e97c944eab12f6798045b1e95a9a779b2b8ada06aff258e89
pdf-font-stream PDF embedded font (sfnt) at offset 0x70DA 10552 bytes