Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ec19208ffe728a…

MALICIOUS

PDF

42.3 KB Created: 2020-08-11 05:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 321729b751ca5f16b080e86f19fe5afc SHA-1: 4471c2b501880ec14a0585f5f12e4f38dadbb8e6 SHA-256: 90ec19208ffe728aad0d713d4b46eb32e749adcfbf0c9b355713063841460033
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, forming a link farm. The primary malicious URL, https://ttraff.cc/pify?keyword=bogy%25C3%25B3+%25C3%25A9s+bab%25C3%25B3ca+vir%25C3%25A1gai+pdf, is identified as a malicious redirector. Many other links point to Shopify domains, which appear to be part of a SEO spam campaign to distribute malicious PDFs. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=bogy%25C3%25B3+%25C3%25A9s+bab%25C3%25B3ca+vir%25C3%25A1gai+pdf
    • http://files.shopebya.com/uploads/1/3/1/3/131380651/dekakexe-gopidi-japapunoregi-kerojed.pdf
    • http://files.christacoetzeeart.com/uploads/1/3/2/6/132680822/jeraxibonijo.pdf
    • http://vovika.aquitaliayachtsusa.com/uploads/1/3/0/8/130814328/8e42c.pdf
    • http://files.tjpfitness.com/uploads/1/3/2/6/132695575/1145300.pdf
    • http://files.kevaneymartin.com/uploads/1/3/1/4/131453615/1405269.pdf
    • https://cdn.shopify.com/s/files/1/0428/7922/1927/files/gofuxujuromexinis.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6702/files/sijilikelonireris.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/68534231389.pdf
    • https://cdn.shopify.com/s/files/1/0433/4924/6110/files/aladdin_original_story.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7407/files/rozugukarikewabu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5689/0013/files/polenunekidoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9599/9129/files/14637084486.pdf
    • https://cdn.shopify.com/s/files/1/0439/4627/9080/files/wewosugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5922/4480/files/19189057851.pdf
    • https://cdn.shopify.com/s/files/1/0430/1602/8309/files/88777371544.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7650/files/30852204481.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/cops_and_robbers_minecraft_maps.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000555b.bin
d8233a5e6f1c45d2cdbe2e0a6f0a7fe47688064ec3514fda9c79e51a13d58166		 pdf-font-stream PDF embedded font (sfnt) at offset 0x555B 5636 bytes
font_01_sfnt_off000067c0.bin
4c3ad0b924594d6540d9c64c85b848fafb876c71d367e6fcae31875d4d14360d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67C0 11860 bytes
font_02_sfnt_off00008c4d.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C4D 4324 bytes

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