Malicious PDF — malware analysis report

Static analysis result for SHA-256 021c0411c0823550…

MALICIOUS

PDF

35.8 KB Created: 2020-08-21 02:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9d67746660ec245592cbd3c88b93aad SHA-1: b8caeba753d367f8711e7f684e6ca17fae26d37e SHA-256: 021c0411c0823550bd1172ef46af14c6c8a7610a91a7c2e5b195b2fb90653ae6
154 Risk Score

Malware Insights

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

The PDF contains a link farm of 26 external PDF links, with the primary malicious link pointing to a redirector. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to manipulate search engine results or distribute malicious content through a large number of links. No scripts were extracted, but the presence of embedded URLs and the link farm heuristic indicate a phishing or content distribution attempt.

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/pify?keyword=fireline+board+data+sheet
    • http://virilusiv.workshopinabox.shop/uploads/1/3/0/8/130813841/1261313.pdf
    • http://files.ncdkg.org/uploads/1/3/0/7/130776578/pasemexabinutis-pojit-zogewe-misowepilev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0462/9400/7968/files/aaee_tamil_movie.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7070/files/rrb_alp_cbt_2_syllabus_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/5283/3695/files/garufubuwokuseza.pdf
    • https://cdn.shopify.com/s/files/1/0429/5399/8487/files/mobibu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5326/8642/files/75151446474.pdf
    • https://cdn.shopify.com/s/files/1/0435/6875/8943/files/dna_hybridization_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0449/4236/0744/files/algorithm_design_and_analysis_by_udit_agarwal_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/45168905977.pdf
    • https://cdn.shopify.com/s/files/1/0428/5657/9228/files/sogapat.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0657/files/power_bengali_movie_video_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/8477/5577/files/nrsv_apocrypha.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000441d.bin
e7e6d5c1cd850e688efc409f62b64f33ef5834d5a757da61aa6eb0260828c038		 pdf-font-stream PDF embedded font (sfnt) at offset 0x441D 4796 bytes
font_01_sfnt_off00005446.bin
eebb1b8b2ab5489eeb1a6949239907849e9539e8ef5ab7ceb0da8bc41feaf05b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5446 9520 bytes
font_02_sfnt_off000074ab.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74AB 4324 bytes

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