Malicious PDF — malware analysis report

Static analysis result for SHA-256 1749ecf6ff7fe8d9…

MALICIOUS

PDF

50.2 KB Created: 2020-08-11 17:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a12f660dfad5cd525b7f39e2533c6cee SHA-1: 0f35054b7f55df91c9c67a199751001a03131490 SHA-256: 1749ecf6ff7fe8d9f76f4ed04472cfb3a8d0e1612164f31bb45a7d17887aecf2
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically identified as a malicious redirector. The document body also contains the same malicious URL, suggesting an attempt to trick users into visiting it. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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/wb?keyword=quran%20pdf%20arabic%20english%20free%20download
    • http://files.timeoutsportsbarandgrill.net/uploads/1/3/1/4/131454286/zobatobatokijixenus.pdf
    • http://jewisur.thesciencelady.co.uk/uploads/1/3/1/6/131606490/fukurigaro-bufob-sepifoje.pdf
    • http://files.boxersvonamadeus.com/uploads/1/3/1/0/131070847/mawepuxukisis_riwujaporub_diditet.pdf
    • http://files.partoencasamujeressabias.com/uploads/1/3/1/4/131453867/dozobelaperisus_petipovanax_samuwutepina.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6587/6379/files/sesiwukiserelenugeporujot.pdf
    • https://cdn.shopify.com/s/files/1/0439/4074/1275/files/romutamuzididotagazo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/vexebebiperifujezum.pdf
    • https://cdn.shopify.com/s/files/1/0428/4183/3635/files/fosuku.pdf
    • https://cdn.shopify.com/s/files/1/0430/9647/3749/files/bangladesh_cost_accounting_standards.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/tufif.pdf
    • https://cdn.shopify.com/s/files/1/0440/9737/2312/files/18650308031.pdf
    • https://cdn.shopify.com/s/files/1/0431/2317/9677/files/letib.pdf
    • https://cdn.shopify.com/s/files/1/0430/5689/0013/files/zedalif.pdf
    • https://cdn.shopify.com/s/files/1/0427/5542/4423/files/simple_present_progressive_tense_worksheets.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ce3.bin
cfe9128a2dec196d8763410bd6be29c9829e4483756135209531e18912c18e47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE3 5712 bytes
font_01_sfnt_off0000704f.bin
56bb57a91d21bad8a2755c9ea1b31ac3055f3bad3a9a7852625f6726520ceabb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x704F 9948 bytes
font_02_sfnt_off0000928d.bin
8eb4918b16c7dfdf4d53df4e7be20aaa256708fc7506247ce2d315afc220eb7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x928D 22848 bytes

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