Malicious PDF — malware analysis report

Static analysis result for SHA-256 021f3e4033354213…

MALICIOUS

PDF

33.6 KB Created: 2020-09-18 06:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 406ac36524c0b6aede21a3bb297165a5 SHA-1: 3b68ef5e188443f434cae8ae2f1365c2ef7b8186 SHA-256: 021f3e403335421346fad33e95b6fcfdc9622a00d00e589c1e9d8168120e55b0
154 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 external PDF files hosted on various domains, suggesting a link farm for SEO manipulation or to obscure malicious redirects. One prominent link, 'https://ttraff.club/wix?keyword=the+federal+court+system+worksheet+answers', is flagged as a malicious redirector. The document body, though heavily corrupted, contains text related to 'The federal court system worksheet answers', indicating a lure to entice users to click the malicious link. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly suggest an attempt to lead the user to a malicious site.

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.club/wix?keyword=the+federal+court+system+worksheet+answers
    • http://files.guntersvillelionsclub.com/uploads/1/3/1/4/131438156/013ad0a11332.pdf
    • http://files.iammonicaparker.com/uploads/1/3/1/4/131437276/6372939.pdf
    • http://jomiz.codyraycomposer.com/uploads/1/3/1/4/131437299/864c8.pdf
    • http://segar.k2physiotherapy.ca/uploads/1/3/0/7/130776783/jaxosos-giwasaleg.pdf
    • http://files.eckiddiecollege.com/uploads/1/3/1/3/131381881/maxijepujuwizas.pdf
    • http://pupatusa.howefarm.ca/uploads/1/3/1/4/131405997/jefidunuwesatejo.pdf
    • http://files.riveroflifechurchtrfmn.com/uploads/1/3/1/3/131381414/b9437.pdf
    • http://files.mdfoodtrucks.com/uploads/1/3/1/3/131379759/xirokanifu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/tudetudux.pdf
    • https://cdn.shopify.com/s/files/1/0437/7857/2450/files/nezonifarovotazebalugo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/php_if_file_exist.pdf
    • https://cdn.shopify.com/s/files/1/0433/8057/2321/files/66190331915.pdf
    • https://cdn.shopify.com/s/files/1/0429/9243/5359/files/97435229397.pdf
    • https://cdn.shopify.com/s/files/1/0432/4425/7442/files/printable_wine_label_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/8266/2553/files/geruwitinerujezejat.pdf
    • https://cdn.shopify.com/s/files/1/0457/7486/4550/files/fiwonetapo.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_off000047b7.bin
10a73309c5d43663b2be8d779184a20f61474c934bece281368b1714c5bddcd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47B7 5468 bytes
font_01_sfnt_off00005a3e.bin
d19521f269d17cef2cd16f3a4fecc268c54a8753ec9484efc802eaa733930504		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A3E 9120 bytes

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