Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba9b854e5768d20…

MALICIOUS

PDF

47.6 KB Created: 2020-11-02 12:46:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2f65a4e586bbbb37344c9c3d1b642fd4 SHA-1: 9c98a5a5c046bfa5c0f7e462d6415325a89058cc SHA-256: fba9b854e5768d206a2ea8c239ddef90ab6c2dd70ddb9e9d7f8b5ae982d2661d
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.com/123?keyword=tubemate+app+pc+download+windows+10 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369907/normal_5f88a8d1972e1.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/sagutirazela.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403407/normal_5f9605cfa764a.pdfIn PDF document text
    • https://sabidodavo.weebly.com/uploads/1/3/1/4/131408103/8d6f517714f66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_5f8734bc49611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426262/normal_5f9c15b14dc95.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8276/7267/files/tanesuxavenilid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/0707/1172/files/daluzujezuso.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/avengers_infinity_war_free_hd_stream.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3164/9689/files/spybubble_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/67508862698.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2D 4728 bytes
SHA-256: 83667d5c02c0684c016e22f2286b3b69c6356efc62a87062613f80d7567c416d
font_01_sfnt_off00006eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB0 5496 bytes
SHA-256: 4e7b762ce6fba8c0c8012dc5ee75ba7084409c701cb99c7542439c0ab4fae3a7
font_02_sfnt_off0000815b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x815B 16408 bytes
SHA-256: ce4fdb47ebd0a525b94a2070b6d64fd0ef790167f1f34f9aa192965caca9a977

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