Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b54d9717a9ffb08…

MALICIOUS

PDF

42.3 KB Created: 2020-08-15 11:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 415e7370fa94afcfde859858310f9226 SHA-1: 7b6ea7fda4a546a3702fc2c908b6331814997199 SHA-256: 6b54d9717a9ffb08bb9be6a44f2fcee1a7a19eaa59650d1e5be021a6c3254ccf
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'prefixes and suffixes worksheets' and includes the malicious URL. The presence of many external PDF links suggests a link farm or SEO poisoning attempt, likely to distribute malicious content or phish users. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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/wb?keyword=prefixes%20and%20suffixes%20worksheets%20with%20answers%20pdf
    • http://files.parsonsperiodpresentations.com/uploads/1/3/0/7/130739782/newazoj.pdf
    • http://files.meeshtheteacher.com/uploads/1/3/2/3/132302923/finiga-nudogawatos.pdf
    • http://soreme.derrenbackergroupbenefits.com/uploads/1/3/0/9/130969723/5841190.pdf
    • http://files.nightfallfarm.com/uploads/1/3/1/4/131408664/lajotanare.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5383/3637/files/american_yard_products.pdf
    • https://cdn.shopify.com/s/files/1/0437/3908/7002/files/xapuxotitipixuseporop.pdf
    • https://cdn.shopify.com/s/files/1/0438/8398/7096/files/nodemcu_esp8266_arduino_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0432/9986/4734/files/juruxavenusofo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/rufomofijakawoverabeleko.pdf
    • https://cdn.shopify.com/s/files/1/0438/0459/0242/files/64109013585.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/pedabekiribo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tapowizilefaj.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5064/files/14353129114.pdf
    • https://cdn.shopify.com/s/files/1/0428/0716/5095/files/uv_vis_spectrophotometer_principle.pdf
    • https://cdn.shopify.com/s/files/1/0447/7750/4925/files/attack_deoxys_solo_guide.pdf
    • https://cdn.shopify.com/s/files/1/0454/8021/4678/files/keto_diet_for_beginners_free.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_off000067d1.bin
596d179b334932556a36f7fbf9b1892d39152671b6df0354012ba28f014a6548		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67D1 5324 bytes
font_01_sfnt_off000079f4.bin
831e0c4375527af5267a97c76782945a2cc335fcb244e051ba03cd404b2f0276		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79F4 9856 bytes

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