Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e86623fcdd40819…

MALICIOUS

PDF

55.2 KB Created: 2020-08-08 11:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80ac164611cd3a02e393182feec4fcd2 SHA-1: e0b8118130eec82a6be7b83e3f6cf48d1ae7c91e SHA-256: 7e86623fcdd4081940a593c958f0d208d995a7164058a821813e4f9ffc153809
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains a URL that matches the redirector found in the heuristics, reinforcing the malicious intent.

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=berliner+platz+2+neu+pdf+kostenlos
    • http://files.stromungexhaust.com/uploads/1/3/1/3/131398177/vupamas.pdf
    • http://files.jeremysony.com/uploads/1/3/0/8/130873893/7368313.pdf
    • http://files.medicalherbalistsussex.com/uploads/1/3/1/4/131483372/jutekegegezevukejulo.pdf
    • http://files.lordbassenterprise.com/uploads/1/3/1/4/131437306/gegufolewowi.pdf
    • http://files.soulsurvivorsband.com/uploads/1/3/0/9/130969545/befokosuwaloxew_sarazizug_vanokewoweziwag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/1818/9980/files/mojisuzuxuvutawo.pdf
    • https://cdn.shopify.com/s/files/1/0438/0049/4237/files/vaves.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/botudurodakokebavexosox.pdf
    • https://cdn.shopify.com/s/files/1/0431/9897/2066/files/xufuderixovojixoje.pdf
    • https://cdn.shopify.com/s/files/1/0438/0629/4176/files/70288233405.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/gawiwojen.pdf
    • https://cdn.shopify.com/s/files/1/0435/3196/0474/files/kojodida.pdf
    • https://cdn.shopify.com/s/files/1/0432/9200/0412/files/oligopoly_graph.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/buxomejatomifugojo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8207/2743/files/wojosavaruxigafa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/dapuzagu.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_off0000732f.bin
ce16817706bc1bf7b42d25ca31e9eef398813e98abc303b250ea1143e850f178		 pdf-font-stream PDF embedded font (sfnt) at offset 0x732F 5212 bytes
font_01_sfnt_off000084fd.bin
1f22b81fb51bf6499896315a1397c3d006f039de6169131bef6d98824e91ede5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84FD 11344 bytes
font_02_sfnt_off0000aa84.bin
811776956d0b1f89c09bcbfbcda3f036884cdce0b7857604712f2e3f276a6025		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA84 16064 bytes
font_03_sfnt_off0000bf30.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF30 4324 bytes

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