Malicious PDF — malware analysis report

Static analysis result for SHA-256 13553b98a48acfcd…

MALICIOUS

PDF

41.9 KB Created: 2020-08-14 12:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6632c2a8488d09dedc9db99a5ee4b80e SHA-1: d4af22b136bb3b7eb719b7a20aa4110b3f20b67d SHA-256: 13553b98a48acfcd7a1d8734237365d35f07afb62d95f47d43b6f81213551300
162 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or SEO-optimized content farms. The primary malicious link identified is 'https://ttraff.com/wb?keyword=metals%20and%20non%20metals%20class%208%20worksheet', which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and appears to be a lure for educational content. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=metals%20and%20non%20metals%20class%208%20worksheet
    • http://wakekuj.oldlakewoodshop.com/uploads/1/3/2/8/132814930/5fb76.pdf
    • http://files.oxfordgardendesign.com/uploads/1/3/1/4/131437683/8624130.pdf
    • http://files.winsoft.com/uploads/1/3/2/3/132302802/xafegisivopaluran.pdf
    • http://files.brightsidecbd.com/uploads/1/3/1/3/131382430/wasexe.pdf
    • http://files.santabarbaraplaces.com/uploads/1/3/1/3/131398440/bitude.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4667/4336/files/alanganallur_jallikattu_video_2012.pdf
    • https://cdn.shopify.com/s/files/1/0437/6051/7269/files/89957638745.pdf
    • https://cdn.shopify.com/s/files/1/0430/4361/8965/files/cfa_level_2_books_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5502/files/42181481303.pdf
    • https://cdn.shopify.com/s/files/1/0432/9465/4632/files/6914257814.pdf
    • https://cdn.shopify.com/s/files/1/0430/1894/4665/files/luzepujujanozajagu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0816/3993/files/fupiregipoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/75320426607.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0888/files/fikevepabokaguba.pdf
    • https://cdn.shopify.com/s/files/1/0433/0471/4404/files/48734538285.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_off0000646f.bin
7ddd71a7634486675ded0f54fb5dd6c2b28359336d1a8f5b82e68165dea3a514		 pdf-font-stream PDF embedded font (sfnt) at offset 0x646F 5532 bytes
font_01_sfnt_off00007725.bin
8f3b11a83f2ebbd0d9b1b565a9b1ced526ae28ca0bcc3d1a602e977646288cce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7725 10420 bytes

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