Malicious PDF — malware analysis report

Static analysis result for SHA-256 68bee6a4eff13161…

MALICIOUS

PDF

43.3 KB Created: 2020-07-30 16:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5ecd68ff2286c1b690bb146fa5e0d0f SHA-1: 408a60d36994425a54ff2762f63ef2bf607308f1 SHA-256: 68bee6a4eff131613d3fc1fa65c002c41bc98234f57da34422d86a55b4d316c2
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a link farm designed to generate traffic and potentially lead users to malicious sites, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Importance of computer in agriculture pdf'. No scripts were extracted, but the primary attack vector appears to be directing users to malicious URLs.

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.cc/pify?keyword=importance+of+computer+in+agriculture+pdf
    • http://files.odysseusorchestra.com/uploads/1/3/0/7/130738779/fetek_fewusava_disavokuwim.pdf
    • http://files.yonelfashion.com/uploads/1/3/1/4/131453682/wodufegegigoxefe.pdf
    • http://files.carenewhaven.org/uploads/1/3/1/1/131164156/delili-jatogifilojuxuj-zuzepokisofox.pdf
    • http://files.kcwes.com/uploads/1/3/0/7/130739758/walugigob_zekej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5940/4197/files/sulopupefuvaxoxuwon.pdf
    • https://cdn.shopify.com/s/files/1/0429/5278/6074/files/55476623316.pdf
    • https://cdn.shopify.com/s/files/1/0434/4958/1724/files/gitipekagadonex.pdf
    • https://cdn.shopify.com/s/files/1/0430/6688/4250/files/nisotimulozojakozupas.pdf
    • https://cdn.shopify.com/s/files/1/0430/8071/2343/files/gotososusobezej.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/suvurufololaberarafunet.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8994/files/naliposo.pdf
    • https://cdn.shopify.com/s/files/1/0436/7984/2457/files/fetom.pdf
    • https://cdn.shopify.com/s/files/1/0427/9340/2534/files/gitojoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/19130898990.pdf
    • https://cdn.shopify.com/s/files/1/0431/8845/3533/files/87454607570.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_off00006d57.bin
2b924dcb2875e115ce2efd203490abd03338daf5e40802fd666fe50f7b47c053		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D57 5116 bytes
font_01_sfnt_off00007e90.bin
5d4fce37975c876f846e92d972e1d917f9ec169235283574ec4dba36bc5605e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E90 9740 bytes

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