Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1f55977627d470…

MALICIOUS

PDF

57.2 KB Created: 2020-08-19 04:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4ba627365a37d62cb3b8808379538ee SHA-1: 495753ac24a22f48d267ce415a6775f78e0c1ba4 SHA-256: fb1f55977627d47054cd4297ccfec1a8b86b6fad69dce75e60b52d37744b0e9e
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for SEO poisoning or redirecting users to malicious sites. One of the embedded URLs, https://ttraff.cc/pify?keyword=bambara+language+pdf, is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of direct payload delivery mechanisms.

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=bambara+language+pdf
    • http://files.sportpic.co.il/uploads/1/3/1/4/131453649/9346619.pdf
    • http://gizokubil.maryandtux.com/uploads/1/3/1/3/131379255/ebca4c57f3.pdf
    • http://files.asianairspace.com/uploads/1/3/0/7/130775201/8053209.pdf
    • http://files.zhenglaimingartschool.com/uploads/1/3/0/7/130776567/modisodozap.pdf
    • https://cdn.shopify.com/s/files/1/0430/8510/3255/files/filuxopezuwuro.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nubizasijimowedemo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5739/files/buvokidukedefugo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8883/0873/files/4781487244.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8887/files/windows_defender_win_10_pro.pdf
    • https://cdn.shopify.com/s/files/1/0433/0605/7883/files/24760424418.pdf
    • https://cdn.shopify.com/s/files/1/0432/1542/1599/files/fuzumixogodanugawi.pdf
    • https://cdn.shopify.com/s/files/1/0443/3244/9948/files/duluwurebezazativav.pdf
    • https://cdn.shopify.com/s/files/1/0435/8724/0095/files/60317218031.pdf
    • https://cdn.shopify.com/s/files/1/0432/8125/2512/files/juwulizuwixu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2360/4631/files/shape_tracing_worksheets_free_printable.pdf
    • https://cdn.shopify.com/s/files/1/0433/3935/0181/files/30383486075.pdf
    • https://cdn.shopify.com/s/files/1/0434/1848/4888/files/vocational_english_for_nursing.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_off00007ab6.bin
c51912800bdfcaedf7e249ae70618c5fb7d9b1ce73cb0279caca0642ea41c7bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB6 5016 bytes
font_01_sfnt_off00008b98.bin
4bc069b141d4ad01121407b755089b3d7c7c0d19ba2eb2d84666143d0c30d0f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B98 12168 bytes
font_02_sfnt_off0000b313.bin
4c3388ea1be5a3eb218cb477660c4bf5a4c243ee26b43c437877fc598d89ca9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB313 16532 bytes
font_03_sfnt_off0000c96e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC96E 4324 bytes

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