Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4ee9d39759bf8d…

MALICIOUS

PDF

60.4 KB Created: 2020-08-20 09:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da787336d2d989573734e80cf882687a SHA-1: d92ed05146faed49e585478f025e46e7d1e48d14 SHA-256: 4b4ee9d39759bf8d04ee1d4a61c2eb2c4eb471c7d9a42f0fdb401e0380b7358f
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with one specifically pointing to a known malicious redirector. The document body itself is heavily obfuscated but contains the same redirector URL and numerous other PDF links hosted on Shopify. This suggests a link farm or SEO poisoning attack designed to drive traffic to malicious sites or distribute further malware.

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/pify?keyword=high+priest+judex+rune+guide
    • http://files.kristinakuhn.com/uploads/1/3/1/3/131380343/sisivaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43545787384.pdf
    • https://cdn.shopify.com/s/files/1/0437/1631/3242/files/nadilomidofurad.pdf
    • https://cdn.shopify.com/s/files/1/0453/6372/4443/files/17879888369.pdf
    • https://cdn.shopify.com/s/files/1/0428/8702/0703/files/redugogizalenugojala.pdf
    • https://cdn.shopify.com/s/files/1/0429/1300/5724/files/antes_de_morirme_libro_completo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9105/0142/files/bobonefebuzebefi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0166/6969/files/98590031549.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4741/files/73191013710.pdf
    • https://cdn.shopify.com/s/files/1/0438/0160/8349/files/vasixuziberufutato.pdf
    • https://cdn.shopify.com/s/files/1/0428/0025/1036/files/zunoseriluruwavepopifoje.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83971047952.pdf
    • https://cdn.shopify.com/s/files/1/0432/8367/7339/files/zapirobunusexik.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000858f.bin
d564136abf0a19fb03724d938c232a831d5331a8c2b79dc2b5b250855bfc3f18
pdf-font-stream PDF embedded font (sfnt) at offset 0x858F 5084 bytes
font_01_sfnt_off000096dd.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
pdf-font-stream PDF embedded font (sfnt) at offset 0x96DD 1800 bytes
font_02_sfnt_off00009f6a.bin
a7b3a0f0002f59ec6e60358dcbcfe5353545933efc32d077f6c168508b641225
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F6A 15232 bytes
font_03_sfnt_off0000cec4.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC4 16312 bytes