Malicious PDF — malware analysis report

Static analysis result for SHA-256 021a4f34973d0105…

MALICIOUS

PDF

46.8 KB Created: 2020-08-07 00:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f2e0674c31723969bef63c0f6240701 SHA-1: b985f718fe410cd403b4f9972bb18f8e7b8eb945 SHA-256: 021a4f34973d0105cd9e80ebb2d184261640e884e36e59abc9d0213d8685571d
162 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 pointing to 'https://ttraff.cc/pify?keyword=adobe+pdf+writer+for+windows+7'. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic suggests a lure to trick users into clicking this link. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=adobe+pdf+writer+for+windows+7
    • http://files.allisonaitken.net/uploads/1/3/1/4/131452922/zavubufoxanumajuzoru.pdf
    • http://xisiwis.aampmuseum.org/uploads/1/3/0/7/130776485/malezaber.pdf
    • http://files.constableweiser.com/uploads/1/3/1/4/131453034/bofom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5800/3096/files/39660160209.pdf
    • https://cdn.shopify.com/s/files/1/0433/0140/4830/files/mikutasenazukafi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2730/7416/files/felepukut.pdf
    • https://cdn.shopify.com/s/files/1/0429/6150/2374/files/newegedudonuwa.pdf
    • https://cdn.shopify.com/s/files/1/0440/2341/4942/files/danny_phantom_season_1_episode_3.pdf
    • https://cdn.shopify.com/s/files/1/0429/8607/8369/files/13323142073.pdf
    • https://cdn.shopify.com/s/files/1/0432/0565/6736/files/putifilaj.pdf
    • https://cdn.shopify.com/s/files/1/0439/4047/9131/files/convert_to_excel_small.pdf
    • https://cdn.shopify.com/s/files/1/0436/2944/5273/files/78691439294.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/82987335019.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mirizopenifipometetotagoz.pdf
    • https://cdn.shopify.com/s/files/1/0440/5251/2918/files/leading_by_example_quotes.pdf
    • https://cdn.shopify.com/s/files/1/0429/0222/5059/files/dizobonexisepudateregaji.pdf
    • https://cdn.shopify.com/s/files/1/0430/3077/3913/files/2633356910.pdf
    • https://cdn.shopify.com/s/files/1/0429/8693/0329/files/homeostasis_biology.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ece.bin
29a88c7496b0c3ffac777a833e1e7d9af63a0e682d1191a478c4f7b25fc256e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4ECE 5236 bytes
font_01_sfnt_off00006138.bin
8f94bf21e10bb898fa753d5f842ca74a95657d4bfdc863a14dce1eb32aa4aa35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6138 5096 bytes
font_02_sfnt_off000072b5.bin
64c966bf752eeab64729dcfac1dfd1ff94fd1bb906531f8de88c6f2b89c0216f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72B5 10448 bytes
font_03_sfnt_off000096ac.bin
d6cec5d81403a3d70faea1540ef19555465bc704c2477342a2b01c02bc8a8e2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96AC 16488 bytes

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