Malicious PDF — malware analysis report

Static analysis result for SHA-256 109737a281d70f06…

MALICIOUS

PDF

63.5 KB Created: 2020-08-03 11:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3a414e4c18bd54ac66e3ffd26617832 SHA-1: bb3c6801eaa5cf1f61bdad73274d5f7e823f0b20 SHA-256: 109737a281d70f067c7498cb79a64303d5793bbdf129a032de594b791001552c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary links, 'https://ttraff.ru/pify?keyword=zeta+psi+pledge+manual', is identified as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, reinforcing the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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=zeta+psi+pledge+manual
    • http://files.greenrabbitpress.com/uploads/1/3/1/3/131398477/rezonakunejizop.pdf
    • http://files.moldingconfidentme.net/uploads/1/3/1/8/131857916/1abc042f.pdf
    • http://zewisa.aspire2bfree.com/uploads/1/3/2/6/132682787/ziloxe.pdf
    • http://files.jspublishing.org/uploads/1/3/0/7/130776590/tateratenaxejagezuda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/9199/0430/files/92628499402.pdf
    • https://cdn.shopify.com/s/files/1/0428/5195/8947/files/60927593037.pdf
    • https://cdn.shopify.com/s/files/1/0440/6912/6309/files/6466190337.pdf
    • https://cdn.shopify.com/s/files/1/0440/0034/6270/files/59392442454.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/sogizisurilume.pdf
    • https://cdn.shopify.com/s/files/1/0433/4052/9816/files/22319985770.pdf
    • https://cdn.shopify.com/s/files/1/0429/2119/7724/files/zokabesapukipotemo.pdf
    • https://cdn.shopify.com/s/files/1/0440/3511/3110/files/8712123445.pdf
    • https://cdn.shopify.com/s/files/1/0437/8322/5506/files/45433184543.pdf
    • https://cdn.shopify.com/s/files/1/0432/8282/5382/files/6054877482.pdf
    • https://cdn.shopify.com/s/files/1/0434/0930/9848/files/devakewopusogib.pdf
    • https://cdn.shopify.com/s/files/1/0438/2877/3021/files/12125646203.pdf
    • https://cdn.shopify.com/s/files/1/0430/7946/7170/files/27582253281.pdf
    • https://cdn.shopify.com/s/files/1/0431/8652/0224/files/58152323175.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_off0000b362.bin
45faef838ee180948263be50543726acfae9ef8ddb65f375a1bad41947984259		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB362 5140 bytes
font_01_sfnt_off0000c4cf.bin
c64d4b6654c6e49f74341c5ad9b4249f222b6abc83e1317e7267caade654023b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CF 14476 bytes

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