Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3313c514da3a17…

MALICIOUS

PDF

35.0 KB Created: 2020-08-23 04:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f8ac1c8ea1e03afe139cb67d0cf08bb SHA-1: bba3c5aa37de7a1670f878dc3bd8846491c41801 SHA-256: 5d3313c514da3a17d2644fccf3238c18cbc08f0c066b13339d2aef0d316d320b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary one leading to a known malicious redirector. The document body, though heavily obfuscated, contains text related to English exercises and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious activity.

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=present+simple+passive+exercises+with+answers+pdf
    • http://files.pearlrivernaz.com/uploads/1/3/1/3/131381021/2007131.pdf
    • http://files.loveinflightphoto.com/uploads/1/3/1/8/131857152/kopikelamalu_xorinodigajaj.pdf
    • http://kekanovam.talkinghardwood.com/uploads/1/3/1/0/131070389/tuvusokeganari.pdf
    • http://tevirom.activelydushi.com/uploads/1/3/2/6/132681459/duruwero.pdf
    • http://files.clearpointtechdesign.com/uploads/1/3/0/7/130775191/2463142.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9795/6256/files/mixed_present_tenses_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/6590/9160/files/15931439974.pdf
    • https://cdn.shopify.com/s/files/1/0435/9979/0243/files/pojinijepamotixa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5358/8390/files/12939318988.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2857609843.pdf
    • https://cdn.shopify.com/s/files/1/0433/5920/7582/files/pexojogifuf.pdf
    • https://cdn.shopify.com/s/files/1/0438/3942/2624/files/matplotlib_draw_rectangle.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6332/files/19064315436.pdf
    • https://cdn.shopify.com/s/files/1/0432/9239/3640/files/77650116556.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/bubble_shooter_2_free_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0432/6978/3720/files/cooling_tower_troubleshooting.pdf
    • https://cdn.shopify.com/s/files/1/0433/0917/0856/files/lekizogemo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0130/6526/files/asme_y14._5_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/8477/5578/files/numokipi.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_off000049ec.bin
aac2148af6f2114e29ba460f38793ab04bba0afcc6b4aface9b0200352261d1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49EC 5616 bytes
font_01_sfnt_off00005cde.bin
14fe5adf3921d01dcaa0f9dbd745f1c2cdd70b2ae9ded4ef3b58b09a91fffe69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CDE 9864 bytes

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