Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9aaba39aaa8737c…

MALICIOUS

PDF

46.7 KB Created: 2020-08-19 01:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10d65c48a0c37fe61889f486dadb5f61 SHA-1: 74fde5a5a5436f2031385f7fb55b6eba8711d62f SHA-256: b9aaba39aaa8737cf3aaba523c339b64904ef3cdd431d8fe8f59220ba15cc82d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One of these links, https://ttraff.ru/pify?keyword=antibiotics+in+early+pregnancy+and+congenital+malformations, is identified as a malicious redirector. The ML classifier strongly indicates maliciousness, and the overall structure suggests a technique to obscure the final malicious destination.

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=antibiotics+in+early+pregnancy+and+congenital+malformations
    • http://files.allsaintschalgrave.org.uk/uploads/1/3/2/6/132681947/wuxebewe.pdf
    • http://files.ruggedboutique.com/uploads/1/3/0/7/130739916/sunofitirutagulida.pdf
    • http://files.myceca.ca/uploads/1/3/1/4/131437471/waperonuwoku.pdf
    • http://files.devotedtotheking.org/uploads/1/3/0/8/130814466/456572.pdf
    • http://files.dlfinancial.org/uploads/1/3/1/3/131379749/tobij.pdf
    • https://cdn.shopify.com/s/files/1/0431/5312/9629/files/the_knight_s_tale_geoffrey_chaucer.pdf
    • https://cdn.shopify.com/s/files/1/0431/9150/0961/files/rinidotexekozojaligute.pdf
    • https://cdn.shopify.com/s/files/1/0433/9594/0519/files/bukutavazigili.pdf
    • https://cdn.shopify.com/s/files/1/0440/6237/6088/files/best_android_ebook_reader_app.pdf
    • https://cdn.shopify.com/s/files/1/0454/4793/8206/files/hypixel_report_cross_teaming.pdf
    • https://cdn.shopify.com/s/files/1/0431/6787/5221/files/modele_attestation_employeur_pole_emploi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7827/0619/files/mufewejuvibizifipolefa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2855/3634/files/saxophone_bebop_scales.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/24697032892.pdf
    • https://cdn.shopify.com/s/files/1/0437/9715/1904/files/vizio_sound_bar_remote_code_directv.pdf
    • https://cdn.shopify.com/s/files/1/0427/8855/2870/files/13987244934.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007779.bin
b9cc3e3c0e298cfe74da2dc859bfb37b3e50f65c02ddf5f21aa2a31012f8848e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7779 5708 bytes
font_01_sfnt_off00008ac2.bin
18252a02e8005f54dace4499da3039da9da692f85807c1c57b8d8708935bd60b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC2 10196 bytes

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