Malicious PDF — malware analysis report

Static analysis result for SHA-256 08cdb9ca3b21fa8f…

MALICIOUS

PDF

46.5 KB Created: 2020-08-26 04:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54432bc25aed1b2de4f1e39012d5e68b SHA-1: 5f3228db5a7769cec970863bdde9e2163cbb1dd8 SHA-256: 08cdb9ca3b21fa8f083b34a85a5e8e29c91351f664645c3b203f7381c3155ced
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 resources, including a known malicious redirector. The document body and embedded links suggest a lure related to 'weekly hourly calendar pdf', likely intended to trick users into visiting malicious sites. 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.com/pify?keyword=weekly+hourly+calendar+pdf
    • http://files.englishangles8.com/uploads/1/3/2/7/132712120/e274a.pdf
    • http://files.coveyoak.com/uploads/1/3/1/4/131437157/1178138.pdf
    • http://jeduw.onehorseranchphotography.com/uploads/1/3/0/9/130969090/tagerobeku.pdf
    • http://semujes.1ofafindonline.com/uploads/1/3/1/3/131380005/zepovabudiki_sugasotosat_wewalifa_jijeman.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2478/5313/files/kewiragigob.pdf
    • https://cdn.shopify.com/s/files/1/0429/6556/5589/files/jejurogoxaxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2521/1298/files/654716764.pdf
    • https://cdn.shopify.com/s/files/1/0439/8697/6926/files/85406662586.pdf
    • https://cdn.shopify.com/s/files/1/0434/1052/2277/files/lakofikimatimu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4996/5985/files/purimusafefudefonijilosag.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/77451670633.pdf
    • https://cdn.shopify.com/s/files/1/0430/1701/1353/files/bwv_125.pdf
    • https://cdn.shopify.com/s/files/1/0429/5183/5801/files/21013528198.pdf
    • https://cdn.shopify.com/s/files/1/0428/6336/2204/files/nuligowetogatobufu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2921/7958/files/gupowufap.pdf
    • https://cdn.shopify.com/s/files/1/0429/9823/5289/files/bugdom_2_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/9479/3635/files/dumiwakepajow.pdf
    • https://cdn.shopify.com/s/files/1/0434/6550/6966/files/14069763158.pdf
    • https://cdn.shopify.com/s/files/1/0428/4448/7836/files/gukosedizonekekeloteb.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_off00006f3f.bin
d377eeacc5b4ba1a1d392534f77f868a5dbb62920069235e25dc955a2e8925e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3F 5244 bytes
font_01_sfnt_off00008124.bin
177f849ee2f8351994f831ce92e6ae665c892949a18f50a9acb27ebec9afc529		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8124 13828 bytes

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