Malicious PDF — malware analysis report

Static analysis result for SHA-256 62987083c981e522…

MALICIOUS

PDF

38.8 KB Created: 2020-08-19 18:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdd66fb1e0903304608fea41873fcf48 SHA-1: 1fd48f874c809bc00b011ad76424eef04edd229e SHA-256: 62987083c981e522fe4df7b743cee52776f30321a63770f044aa7c2814b78583
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is a common tactic for phishing and malware distribution. The document body, though obfuscated, contains text related to 'action verbs worksheets for grade 3' and the malicious URL, suggesting a lure to disguise the malicious intent. The presence of numerous external PDF links further indicates a link farm, likely for SEO manipulation or to host further malicious content.

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=action+verbs+worksheets+for+grade+3
    • http://mevigiseg.margaretgracie.com/uploads/1/3/1/6/131637136/7432508b846.pdf
    • http://jinuwuna.nysacanecorso.com/uploads/1/3/0/9/130969873/0eb25fab2121.pdf
    • http://zomon.baw-weapons.yez.dk/uploads/1/3/1/4/131406798/9905175.pdf
    • http://files.tlghk.org/uploads/1/3/1/0/131070151/494090.pdf
    • http://ditoj.beats2godj.com/uploads/1/3/2/6/132682883/pikeviribosez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/78437634486.pdf
    • https://cdn.shopify.com/s/files/1/0432/3776/9384/files/beavers_bend_fly_shop.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/dezixovud.pdf
    • https://cdn.shopify.com/s/files/1/0432/8010/5630/files/18280423787.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76102764406.pdf
    • https://cdn.shopify.com/s/files/1/0437/8699/3813/files/23109131733.pdf
    • https://cdn.shopify.com/s/files/1/0428/9177/2063/files/38377906909.pdf
    • https://cdn.shopify.com/s/files/1/0437/6051/7271/files/mererori.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_off0000587b.bin
7414c0cf129ccf6df5c3afce21bc05925b2295a9695f1f824a8e9945b34a14b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x587B 5760 bytes
font_01_sfnt_off00006c22.bin
1b6404deaafd88c9e72574e869c30337497c4581ae42a2058201add66f755d97
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C22 10044 bytes